The impact of spiral arms on the star formation life cycle

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Table A.1.

Best-fitting parameters obtained from performing our statistical analysis to 22 spiral galaxies.

Galaxy	Region	t_CO[Myr]	t_fb[Myr]	λ[pc]	ϵ_SF[%]	Σ_CO, comp	Σ_SFR	ε_gas	t_ref[Myr]
IC 1954	inter-arm	$9 . 5_{- 2.3}^{+ 4.1}$ $9.5^{+4.1}_{-2.3}$	$2 . 7_{- 1.3}^{+ 1.7}$ $2.7^{+1.7}_{-1.3}$	$233_{- 52}^{+ 108}$ $233^{+108}_{-52}$	$2 . 2_{- 1.0}^{+ 2.1}$ $2.2^{+2.1}_{-1.0}$	$2 . 3_{- 1.2}^{+ 1.2}$ $2.3^{+1.2}_{-1.2}$	$4 . 0_{- 0.8}^{+ 0.8}$ $4.0^{+0.8}_{-0.8}$	$6 . 7_{- 2.7}^{+ 3.8}$ $6.7^{+3.8}_{-2.7}$	$4 . 49_{- 0.20}^{+ 0.07}$ $4.49^{+0.07}_{-0.20}$
	spiral arm (*)	$22 . 4_{- 4.1}^{+ 13.7}$ $22.4^{+13.7}_{-4.1}$	$4 . 5_{- 1.6}^{+ 4.5}$ $4.5^{+4.5}_{-1.6}$	$163_{- 38}^{+ 86}$ $163^{+86}_{-38}$	$4 . 7_{- 1.9}^{+ 6.4}$ $4.7^{+6.4}_{-1.9}$	$4 . 5_{- 2.2}^{+ 2.2}$ $4.5^{+2.2}_{-2.2}$	$6 . 2_{- 1.2}^{+ 1.2}$ $6.2^{+1.2}_{-1.2}$	$4 . 1_{- 1.1}^{+ 1.3}$ $4.1^{+1.3}_{-1.1}$	$4 . 46_{- 0.20}^{+ 0.08}$ $4.46^{+0.08}_{-0.20}$

NGC 0628	inter-arm	$22 . 0_{- 4.4}^{+ 4.1}$ $22.0^{+4.1}_{-4.4}$	$2 . 8_{- 0.9}^{+ 0.8}$ $2.8^{+0.8}_{-0.9}$	$111_{- 16}^{+ 19}$ $111^{+19}_{-16}$	$6 . 8_{- 3.0}^{+ 5.3}$ $6.8^{+5.3}_{-3.0}$	$2 . 8_{- 1.4}^{+ 1.4}$ $2.8^{+1.4}_{-1.4}$	$6 . 0_{- 1.2}^{+ 1.2}$ $6.0^{+1.2}_{-1.2}$	$12 . 9_{- 3.0}^{+ 3.6}$ $12.9^{+3.6}_{-3.0}$	$4 . 47_{- 0.20}^{+ 0.08}$ $4.47^{+0.08}_{-0.20}$
	spiral arm	$27 . 1_{- 2.8}^{+ 3.3}$ $27.1^{+3.3}_{-2.8}$	$3 . 7_{- 0.6}^{+ 0.8}$ $3.7^{+0.8}_{-0.6}$	$90_{- 11}^{+ 15}$ $90^{+15}_{-11}$	$6 . 2_{- 2.6}^{+ 4.6}$ $6.2^{+4.6}_{-2.6}$	$6 . 7_{- 3.4}^{+ 3.4}$ $6.7^{+3.4}_{-3.4}$	$10 . 1_{- 2.0}^{+ 2.0}$ $10.1^{+2.0}_{-2.0}$	$7 . 3_{- 1.0}^{+ 1.1}$ $7.3^{+1.1}_{-1.0}$	$4 . 47_{- 0.20}^{+ 0.08}$ $4.47^{+0.08}_{-0.20}$

NGC 1097	inter-arm	$16 . 3_{- 2.6}^{+ 3.6}$ $16.3^{+3.6}_{-2.6}$	$1 . 0_{- 0.6}^{+ 0.7}$ $1.0^{+0.7}_{-0.6}$	$237_{- 31}^{+ 59}$ $237^{+59}_{-31}$	$3 . 4_{- 1.5}^{+ 2.8}$ $3.4^{+2.8}_{-1.5}$	$3 . 6_{- 1.8}^{+ 1.8}$ $3.6^{+1.8}_{-1.8}$	$5 . 0_{- 1.0}^{+ 1.0}$ $5.0^{+1.0}_{-1.0}$	$6 . 4_{- 1.3}^{+ 1.5}$ $6.4^{+1.5}_{-1.3}$	$4 . 35_{- 0.22}^{+ 0.09}$ $4.35^{+0.09}_{-0.22}$
	spiral arm (*)	$13 . 3_{- 3.0}^{+ 5.9}$ $13.3^{+5.9}_{-3.0}$	$1 . 3_{- 0.7}^{+ 1.2}$ $1.3^{+1.2}_{-0.7}$	$187_{- 20}^{+ 43}$ $187^{+43}_{-20}$	$2 . 2_{- 1.0}^{+ 2.1}$ $2.2^{+2.1}_{-1.0}$	$5 . 1_{- 2.6}^{+ 2.6}$ $5.1^{+2.6}_{-2.6}$	$5 . 6_{- 1.1}^{+ 1.1}$ $5.6^{+1.1}_{-1.1}$	$4 . 3_{- 0.5}^{+ 0.5}$ $4.3^{+0.5}_{-0.5}$	$4 . 37_{- 0.22}^{+ 0.09}$ $4.37^{+0.09}_{-0.22}$

NGC 1300	inter-arm	$14 . 4_{- 1.8}^{+ 3.5}$ $14.4^{+3.5}_{-1.8}$	$2 . 3_{- 0.4}^{+ 0.7}$ $2.3^{+0.7}_{-0.4}$	$386_{- 63}^{+ 84}$ $386^{+84}_{-63}$	$3 . 5_{- 1.5}^{+ 2.7}$ $3.5^{+2.7}_{-1.5}$	$1 . 3_{- 0.6}^{+ 0.6}$ $1.3^{+0.6}_{-0.6}$	$1 . 8_{- 0.4}^{+ 0.4}$ $1.8^{+0.4}_{-0.4}$	$18 . 1_{- 6.3}^{+ 8.4}$ $18.1^{+8.4}_{-6.3}$	$4 . 44_{- 0.21}^{+ 0.08}$ $4.44^{+0.08}_{-0.21}$
	spiral arm	$15 . 5_{- 3.6}^{+ 3.2}$ $15.5^{+3.2}_{-3.6}$	$4 . 5_{- 1.5}^{+ 1.1}$ $4.5^{+1.1}_{-1.5}$	$255_{- 48}^{+ 52}$ $255^{+52}_{-48}$	$2 . 1_{- 0.9}^{+ 1.7}$ $2.1^{+1.7}_{-0.9}$	$4 . 3_{- 2.1}^{+ 2.1}$ $4.3^{+2.1}_{-2.1}$	$4 . 0_{- 0.8}^{+ 0.8}$ $4.0^{+0.8}_{-0.8}$	$7 . 7_{- 2.1}^{+ 2.6}$ $7.7^{+2.6}_{-2.1}$	$4 . 45_{- 0.20}^{+ 0.08}$ $4.45^{+0.08}_{-0.20}$

NGC 1365	inter-arm	$32 . 1_{- 7.9}^{+ 16.7}$ $32.1^{+16.7}_{-7.9}$	$4 . 4_{- 1.5}^{+ 2.4}$ $4.4^{+2.4}_{-1.5}$	$360_{- 105}^{+ 125}$ $360^{+125}_{-105}$	$6 . 8_{- 3.0}^{+ 7.7}$ $6.8^{+7.7}_{-3.0}$	$4 . 7_{- 2.3}^{+ 2.3}$ $4.7^{+2.3}_{-2.3}$	$6 . 6_{- 1.3}^{+ 1.3}$ $6.6^{+1.3}_{-1.3}$	$5 . 7_{- 2.0}^{+ 2.7}$ $5.7^{+2.7}_{-2.0}$	$4 . 42_{- 0.21}^{+ 0.08}$ $4.42^{+0.08}_{-0.21}$
	spiral arm	$11 . 0_{- 2.4}^{+ 9.7}$ $11.0^{+9.7}_{-2.4}$	$3 . 8_{- 1.5}^{+ 4.5}$ $3.8^{+4.5}_{-1.5}$	$266_{- 77}^{+ 209}$ $266^{+209}_{-77}$	$2 . 1_{- 0.9}^{+ 3.0}$ $2.1^{+3.0}_{-0.9}$	$10 . 0_{- 5.0}^{+ 5.0}$ $10.0^{+5.0}_{-5.0}$	$12 . 3_{- 2.5}^{+ 2.5}$ $12.3^{+2.5}_{-2.5}$	$4 . 1_{- 1.4}^{+ 2.0}$ $4.1^{+2.0}_{-1.4}$	$4 . 44_{- 0.20}^{+ 0.08}$ $4.44^{+0.08}_{-0.20}$

NGC 1385	inter-arm (*)	$18 . 0_{- 4.3}^{+ 8.5}$ $18.0^{+8.5}_{-4.3}$	$3 . 2_{- 1.2}^{+ 2.4}$ $3.2^{+2.4}_{-1.2}$	$174_{- 35}^{+ 80}$ $174^{+80}_{-35}$	$7 . 5_{- 3.2}^{+ 7.8}$ $7.5^{+7.8}_{-3.2}$	$7 . 1_{- 3.5}^{+ 3.5}$ $7.1^{+3.5}_{-3.5}$	$19 . 4_{- 3.9}^{+ 3.9}$ $19.4^{+3.9}_{-3.9}$	$7 . 4_{- 2.3}^{+ 3.2}$ $7.4^{+3.2}_{-2.3}$	$4 . 55_{- 0.18}^{+ 0.07}$ $4.55^{+0.07}_{-0.18}$
	spiral arm (*)	$10 . 0_{- 2.3}^{+ 3.7}$ $10.0^{+3.7}_{-2.3}$	$2 . 4_{- 1.0}^{+ 1.6}$ $2.4^{+1.6}_{-1.0}$	$176_{- 37}^{+ 99}$ $176^{+99}_{-37}$	$2 . 6_{- 1.1}^{+ 2.4}$ $2.6^{+2.4}_{-1.1}$	$7 . 3_{- 3.7}^{+ 3.7}$ $7.3^{+3.7}_{-3.7}$	$12 . 0_{- 2.4}^{+ 2.4}$ $12.0^{+2.4}_{-2.4}$	$7 . 3_{- 2.4}^{+ 3.3}$ $7.3^{+3.3}_{-2.4}$	$4 . 55_{- 0.18}^{+ 0.07}$ $4.55^{+0.07}_{-0.18}$

NGC 1512	inter-arm	$8 . 7_{- 1.4}^{+ 2.7}$ $8.7^{+2.7}_{-1.4}$	$1 . 8_{- 0.6}^{+ 0.4}$ $1.8^{+0.4}_{-0.6}$	$323_{- 99}^{+ 95}$ $323^{+95}_{-99}$	$3 . 1_{- 1.3}^{+ 2.8}$ $3.1^{+2.8}_{-1.3}$	$0 . 6_{- 0.3}^{+ 0.3}$ $0.6^{+0.3}_{-0.3}$	$1 . 5_{- 0.3}^{+ 0.3}$ $1.5^{+0.3}_{-0.3}$	$25 . 9_{- 13.6}^{+ 22.4}$ $25.9^{+22.4}_{-13.6}$	$4 . 42_{- 0.21}^{+ 0.08}$ $4.42^{+0.08}_{-0.21}$
	spiral arm	$13 . 9_{- 2.3}^{+ 2.5}$ $13.9^{+2.5}_{-2.3}$	$1 . 9_{- 0.5}^{+ 0.5}$ $1.9^{+0.5}_{-0.5}$	$245_{- 25}^{+ 29}$ $245^{+29}_{-25}$	$3 . 0_{- 1.4}^{+ 2.2}$ $3.0^{+2.2}_{-1.4}$	$1 . 5_{- 0.8}^{+ 0.8}$ $1.5^{+0.8}_{-0.8}$	$2 . 0_{- 0.4}^{+ 0.4}$ $2.0^{+0.4}_{-0.4}$	$11 . 2_{- 1.9}^{+ 2.1}$ $11.2^{+2.1}_{-1.9}$	$4 . 42_{- 0.21}^{+ 0.08}$ $4.42^{+0.08}_{-0.21}$

NGC 1672	inter-arm	$19 . 7_{- 4.7}^{+ 5.7}$ $19.7^{+5.7}_{-4.7}$	$3 . 8_{- 1.5}^{+ 1.9}$ $3.8^{+1.9}_{-1.5}$	$324_{- 83}^{+ 173}$ $324^{+173}_{-83}$	$6 . 1_{- 2.8}^{+ 5.1}$ $6.1^{+5.1}_{-2.8}$	$3 . 9_{- 2.0}^{+ 2.0}$ $3.9^{+2.0}_{-2.0}$	$8 . 2_{- 1.6}^{+ 1.6}$ $8.2^{+1.6}_{-1.6}$	$7 . 2_{- 2.8}^{+ 4.2}$ $7.2^{+4.2}_{-2.8}$	$4 . 43_{- 0.21}^{+ 0.08}$ $4.43^{+0.08}_{-0.21}$
	spiral arm (*)	$37 . 8_{- 7.7}^{+ 103.5}$ $37.8^{+103.5}_{-7.7}$	$9 . 2_{- 3.5}^{+ 29.1}$ $9.2^{+29.1}_{-3.5}$	$292_{- 80}^{+ 117}$ $292^{+117}_{-80}$	$7 . 1_{- 2.8}^{+ 20.4}$ $7.1^{+20.4}_{-2.8}$	$11 . 1_{- 5.6}^{+ 5.6}$ $11.1^{+5.6}_{-5.6}$	$12 . 9_{- 2.6}^{+ 2.6}$ $12.9^{+2.6}_{-2.6}$	$4 . 7_{- 1.3}^{+ 1.6}$ $4.7^{+1.6}_{-1.3}$	$4 . 44_{- 0.21}^{+ 0.08}$ $4.44^{+0.08}_{-0.21}$

NGC 2090	inter-arm	$7 . 8_{- 1.4}^{+ 1.7}$ $7.8^{+1.7}_{-1.4}$	$0 . 8_{- 0.4}^{+ 0.5}$ $0.8^{+0.5}_{-0.4}$	$235_{- 36}^{+ 69}$ $235^{+69}_{-36}$	$2 . 8_{- 1.3}^{+ 2.0}$ $2.8^{+2.0}_{-1.3}$	$1 . 1_{- 0.6}^{+ 0.6}$ $1.1^{+0.6}_{-0.6}$	$2 . 5_{- 0.5}^{+ 0.5}$ $2.5^{+0.5}_{-0.5}$	$12 . 8_{- 4.4}^{+ 5.9}$ $12.8^{+5.9}_{-4.4}$	$4 . 43_{- 0.21}^{+ 0.08}$ $4.43^{+0.08}_{-0.21}$
	spiral arm (*)	$11 . 5_{- 2.6}^{+ 8.6}$ $11.5^{+8.6}_{-2.6}$	$1 . 9_{- 1.0}^{+ 3.2}$ $1.9^{+3.2}_{-1.0}$	$132_{- 24}^{+ 47}$ $132^{+47}_{-24}$	$1 . 8_{- 0.7}^{+ 2.3}$ $1.8^{+2.3}_{-0.7}$	$5 . 8_{- 2.9}^{+ 2.9}$ $5.8^{+2.9}_{-2.9}$	$5 . 7_{- 1.1}^{+ 1.1}$ $5.7^{+1.1}_{-1.1}$	$3 . 1_{- 0.7}^{+ 0.9}$ $3.1^{+0.9}_{-0.7}$	$4 . 39_{- 0.21}^{+ 0.08}$ $4.39^{+0.08}_{-0.21}$

NGC 2283	inter-arm	$9 . 1_{- 1.8}^{+ 1.6}$ $9.1^{+1.6}_{-1.8}$	$2 . 7_{- 0.8}^{+ 0.5}$ $2.7^{+0.5}_{-0.8}$	$328_{- 74}^{+ 102}$ $328^{+102}_{-74}$	$3 . 9_{- 1.7}^{+ 2.8}$ $3.9^{+2.8}_{-1.7}$	$1 . 7_{- 0.9}^{+ 0.9}$ $1.7^{+0.9}_{-0.9}$	$5 . 2_{- 1.0}^{+ 1.0}$ $5.2^{+1.0}_{-1.0}$	$14 . 1_{- 6.2}^{+ 9.1}$ $14.1^{+9.1}_{-6.2}$	$4 . 44_{- 0.20}^{+ 0.08}$ $4.44^{+0.08}_{-0.20}$
	spiral arm (*)	$12 . 2_{- 3.5}^{+ 7.8}$ $12.2^{+7.8}_{-3.5}$	$3 . 8_{- 1.8}^{+ 4.1}$ $3.8^{+4.1}_{-1.8}$	$152_{- 40}^{+ 156}$ $152^{+156}_{-40}$	$5 . 4_{- 2.4}^{+ 6.4}$ $5.4^{+6.4}_{-2.4}$	$4 . 6_{- 2.3}^{+ 2.3}$ $4.6^{+2.3}_{-2.3}$	$13 . 2_{- 2.6}^{+ 2.6}$ $13.2^{+2.6}_{-2.6}$	$6 . 1_{- 3.2}^{+ 6.3}$ $6.1^{+6.3}_{-3.2}$	$4 . 42_{- 0.22}^{+ 0.08}$ $4.42^{+0.08}_{-0.22}$

NGC 2835	inter-arm	$6 . 6_{- 1.1}^{+ 1.4}$ $6.6^{+1.4}_{-1.1}$	$0 . 9_{- 0.4}^{+ 0.5}$ $0.9^{+0.5}_{-0.4}$	$167_{- 32}^{+ 58}$ $167^{+58}_{-32}$	$2 . 0_{- 0.9}^{+ 1.6}$ $2.0^{+1.6}_{-0.9}$	$2 . 4_{- 1.2}^{+ 1.2}$ $2.4^{+1.2}_{-1.2}$	$4 . 9_{- 1.0}^{+ 1.0}$ $4.9^{+1.0}_{-1.0}$	$14 . 9_{- 5.6}^{+ 7.7}$ $14.9^{+7.7}_{-5.6}$	$4 . 59_{- 0.17}^{+ 0.06}$ $4.59^{+0.06}_{-0.17}$
	spiral arm	$10 . 7_{- 2.2}^{+ 2.6}$ $10.7^{+2.6}_{-2.2}$	$1 . 9_{- 0.7}^{+ 0.9}$ $1.9^{+0.9}_{-0.7}$	$132_{- 18}^{+ 39}$ $132^{+39}_{-18}$	$2 . 9_{- 1.3}^{+ 2.4}$ $2.9^{+2.4}_{-1.3}$	$4 . 6_{- 2.3}^{+ 2.3}$ $4.6^{+2.3}_{-2.3}$	$7 . 8_{- 1.6}^{+ 1.6}$ $7.8^{+1.6}_{-1.6}$	$8 . 8_{- 2.7}^{+ 3.6}$ $8.8^{+3.6}_{-2.7}$	$4 . 59_{- 0.21}^{+ 0.06}$ $4.59^{+0.06}_{-0.21}$

NGC 2997	inter-arm	$15 . 9_{- 1.9}^{+ 1.8}$ $15.9^{+1.8}_{-1.9}$	$3 . 4_{- 0.7}^{+ 0.6}$ $3.4^{+0.6}_{-0.7}$	$266_{- 37}^{+ 49}$ $266^{+49}_{-37}$	$4 . 0_{- 1.7}^{+ 2.9}$ $4.0^{+2.9}_{-1.7}$	$3 . 7_{- 1.9}^{+ 1.9}$ $3.7^{+1.9}_{-1.9}$	$6 . 5_{- 1.3}^{+ 1.3}$ $6.5^{+1.3}_{-1.3}$	$10 . 2_{- 2.5}^{+ 3.0}$ $10.2^{+3.0}_{-2.5}$	$4 . 43_{- 0.21}^{+ 0.08}$ $4.43^{+0.08}_{-0.21}$
	spiral arm	$18 . 7_{- 2.8}^{+ 6.2}$ $18.7^{+6.2}_{-2.8}$	$5 . 3_{- 1.2}^{+ 2.5}$ $5.3^{+2.5}_{-1.2}$	$215_{- 37}^{+ 64}$ $215^{+64}_{-37}$	$2 . 9_{- 1.2}^{+ 2.7}$ $2.9^{+2.7}_{-1.2}$	$14 . 0_{- 7.0}^{+ 7.0}$ $14.0^{+7.0}_{-7.0}$	$13 . 7_{- 2.7}^{+ 2.7}$ $13.7^{+2.7}_{-2.7}$	$5 . 4_{- 1.2}^{+ 1.4}$ $5.4^{+1.4}_{-1.2}$	$4 . 42_{- 0.17}^{+ 0.08}$ $4.42^{+0.08}_{-0.17}$

NGC 3507	inter-arm	$19 . 3_{- 4.0}^{+ 5.8}$ $19.3^{+5.8}_{-4.0}$	$2 . 1_{- 0.7}^{+ 1.5}$ $2.1^{+1.5}_{-0.7}$	$321_{- 59}^{+ 156}$ $321^{+156}_{-59}$	$4 . 5_{- 2.0}^{+ 3.7}$ $4.5^{+3.7}_{-2.0}$	$2 . 0_{- 1.0}^{+ 1.0}$ $2.0^{+1.0}_{-1.0}$	$2 . 9_{- 0.6}^{+ 0.6}$ $2.9^{+0.6}_{-0.6}$	$8 . 4_{- 3.7}^{+ 5.7}$ $8.4^{+5.7}_{-3.7}$	$4 . 45_{- 0.20}^{+ 0.08}$ $4.45^{+0.08}_{-0.20}$
	spiral arm (*)	$9 . 1_{- 1.3}^{+ 1.9}$ $9.1^{+1.9}_{-1.3}$	$2 . 6_{- 0.7}^{+ 1.1}$ $2.6^{+1.1}_{-0.7}$	$242_{- 42}^{+ 87}$ $242^{+87}_{-42}$	$1 . 4_{- 0.6}^{+ 1.1}$ $1.4^{+1.1}_{-0.6}$	$5 . 1_{- 2.6}^{+ 2.6}$ $5.1^{+2.6}_{-2.6}$	$4 . 8_{- 1.0}^{+ 1.0}$ $4.8^{+1.0}_{-1.0}$	$5 . 2_{- 1.2}^{+ 1.5}$ $5.2^{+1.5}_{-1.2}$	$4 . 44_{- 0.21}^{+ 0.08}$ $4.44^{+0.08}_{-0.21}$

NGC 3627	inter-arm	$14 . 2_{- 2.2}^{+ 3.0}$ $14.2^{+3.0}_{-2.2}$	$1 . 3_{- 0.5}^{+ 0.7}$ $1.3^{+0.7}_{-0.5}$	$224_{- 25}^{+ 37}$ $224^{+37}_{-25}$	$5 . 1_{- 2.2}^{+ 4.0}$ $5.1^{+4.0}_{-2.2}$	$5 . 8_{- 2.9}^{+ 2.9}$ $5.8^{+2.9}_{-2.9}$	$13 . 5_{- 2.7}^{+ 2.7}$ $13.5^{+2.7}_{-2.7}$	$7 . 7_{- 1.2}^{+ 1.3}$ $7.7^{+1.3}_{-1.2}$	$4 . 43_{- 0.21}^{+ 0.08}$ $4.43^{+0.08}_{-0.21}$
	spiral arm	$17 . 2_{- 3.2}^{+ 5.6}$ $17.2^{+5.6}_{-3.2}$	$3 . 1_{- 1.2}^{+ 1.8}$ $3.1^{+1.8}_{-1.2}$	$187_{- 40}^{+ 77}$ $187^{+77}_{-40}$	$3 . 1_{- 1.4}^{+ 2.7}$ $3.1^{+2.7}_{-1.4}$	$26 . 8_{- 13.4}^{+ 13.4}$ $26.8^{+13.4}_{-13.4}$	$31 . 2_{- 6.2}^{+ 6.2}$ $31.2^{+6.2}_{-6.2}$	$4 . 1_{- 1.1}^{+ 1.4}$ $4.1^{+1.4}_{-1.1}$	$4 . 44_{- 0.21}^{+ 0.08}$ $4.44^{+0.08}_{-0.21}$

NGC 4254	inter-arm	$17 . 0_{- 2.0}^{+ 2.6}$ $17.0^{+2.6}_{-2.0}$	$4 . 6_{- 1.0}^{+ 0.9}$ $4.6^{+0.9}_{-1.0}$	$264_{- 71}^{+ 74}$ $264^{+74}_{-71}$	$3 . 7_{- 1.6}^{+ 2.7}$ $3.7^{+2.7}_{-1.6}$	$8 . 4_{- 4.2}^{+ 4.2}$ $8.4^{+4.2}_{-4.2}$	$12 . 1_{- 2.4}^{+ 2.4}$ $12.1^{+2.4}_{-2.4}$	$7 . 1_{- 2.4}^{+ 3.1}$ $7.1^{+3.1}_{-2.4}$	$4 . 46_{- 0.20}^{+ 0.08}$ $4.46^{+0.08}_{-0.20}$
	spiral arm	$17 . 7_{- 2.2}^{+ 7.6}$ $17.7^{+7.6}_{-2.2}$	$5 . 0_{- 1.2}^{+ 3.1}$ $5.0^{+3.1}_{-1.2}$	$197_{- 39}^{+ 62}$ $197^{+62}_{-39}$	$3 . 7_{- 1.7}^{+ 3.5}$ $3.7^{+3.5}_{-1.7}$	$16 . 2_{- 8.1}^{+ 8.1}$ $16.2^{+8.1}_{-8.1}$	$20 . 6_{- 4.1}^{+ 4.1}$ $20.6^{+4.1}_{-4.1}$	$4 . 6_{- 0.9}^{+ 1.1}$ $4.6^{+1.1}_{-0.9}$	$4 . 45_{- 0.21}^{+ 0.08}$ $4.45^{+0.08}_{-0.21}$

NGC 4303	inter-arm	$31 . 2_{- 6.4}^{+ 11.8}$ $31.2^{+11.8}_{-6.4}$	$6 . 6_{- 1.9}^{+ 2.9}$ $6.6^{+2.9}_{-1.9}$	$320_{- 49}^{+ 77}$ $320^{+77}_{-49}$	$11 . 0_{- 4.9}^{+ 17.4}$ $11.0^{+17.4}_{-4.9}$	$6 . 7_{- 3.4}^{+ 3.4}$ $6.7^{+3.4}_{-3.4}$	$15 . 1_{- 3.0}^{+ 3.0}$ $15.1^{+3.0}_{-3.0}$	$6 . 0_{- 1.7}^{+ 2.1}$ $6.0^{+2.1}_{-1.7}$	$4 . 41_{- 0.21}^{+ 0.08}$ $4.41^{+0.08}_{-0.21}$
	spiral arm (*)	$17 . 4_{- 2.9}^{+ 5.0}$ $17.4^{+5.0}_{-2.9}$	$3 . 6_{- 1.4}^{+ 2.1}$ $3.6^{+2.1}_{-1.4}$	$233_{- 49}^{+ 96}$ $233^{+96}_{-49}$	$5 . 2_{- 2.2}^{+ 4.4}$ $5.2^{+4.4}_{-2.2}$	$17 . 3_{- 8.6}^{+ 8.6}$ $17.3^{+8.6}_{-8.6}$	$33 . 2_{- 6.6}^{+ 6.6}$ $33.2^{+6.6}_{-6.6}$	$4 . 2_{- 1.1}^{+ 1.4}$ $4.2^{+1.4}_{-1.1}$	$4 . 39_{- 0.20}^{+ 0.08}$ $4.39^{+0.08}_{-0.20}$

NGC 4321	inter-arm	$29 . 9_{- 3.7}^{+ 4.9}$ $29.9^{+4.9}_{-3.7}$	$3 . 8_{- 1.0}^{+ 1.2}$ $3.8^{+1.2}_{-1.0}$	$265_{- 38}^{+ 51}$ $265^{+51}_{-38}$	$7 . 9_{- 3.4}^{+ 5.9}$ $7.9^{+5.9}_{-3.4}$	$4 . 0_{- 2.0}^{+ 2.0}$ $4.0^{+2.0}_{-2.0}$	$6 . 8_{- 1.4}^{+ 1.4}$ $6.8^{+1.4}_{-1.4}$	$6 . 3_{- 1.3}^{+ 1.5}$ $6.3^{+1.5}_{-1.3}$	$4 . 41_{- 0.21}^{+ 0.08}$ $4.41^{+0.08}_{-0.21}$
	spiral arm (*)	$15 . 0_{- 2.0}^{+ 3.2}$ $15.0^{+3.2}_{-2.0}$	$2 . 6_{- 0.6}^{+ 1.1}$ $2.6^{+1.1}_{-0.6}$	$196_{- 24}^{+ 36}$ $196^{+36}_{-24}$	$2 . 4_{- 1.0}^{+ 1.9}$ $2.4^{+1.9}_{-1.0}$	$10 . 6_{- 5.3}^{+ 5.3}$ $10.6^{+5.3}_{-5.3}$	$11 . 1_{- 2.2}^{+ 2.2}$ $11.1^{+2.2}_{-2.2}$	$4 . 6_{- 0.6}^{+ 0.7}$ $4.6^{+0.7}_{-0.6}$	$4 . 39_{- 0.22}^{+ 0.08}$ $4.39^{+0.08}_{-0.22}$

NGC 4535	inter-arm	$33 . 2_{- 5.5}^{+ 73.0}$ $33.2^{+73.0}_{-5.5}$	$5 . 0_{- 1.1}^{+ 13.8}$ $5.0^{+13.8}_{-1.1}$	$267_{- 39}^{+ 56}$ $267^{+56}_{-39}$	$8 . 9_{- 3.8}^{+ 17.1}$ $8.9^{+17.1}_{-3.8}$	$2 . 4_{- 1.2}^{+ 1.2}$ $2.4^{+1.2}_{-1.2}$	$4 . 4_{- 0.9}^{+ 0.9}$ $4.4^{+0.9}_{-0.9}$	$8 . 9_{- 2.0}^{+ 2.4}$ $8.9^{+2.4}_{-2.0}$	$4 . 43_{- 0.21}^{+ 0.08}$ $4.43^{+0.08}_{-0.21}$
	spiral arm	$17 . 6_{- 3.0}^{+ 86.9}$ $17.6^{+86.9}_{-3.0}$	$4 . 6_{- 1.2}^{+ 29.0}$ $4.6^{+29.0}_{-1.2}$	$223_{- 51}^{+ 101}$ $223^{+101}_{-51}$	$2 . 2_{- 0.9}^{+ 10.7}$ $2.2^{+10.7}_{-0.9}$	$9 . 5_{- 4.7}^{+ 4.7}$ $9.5^{+4.7}_{-4.7}$	$7 . 7_{- 1.5}^{+ 1.5}$ $7.7^{+1.5}_{-1.5}$	$5 . 6_{- 1.7}^{+ 2.2}$ $5.6^{+2.2}_{-1.7}$	$4 . 42_{- 0.22}^{+ 0.08}$ $4.42^{+0.08}_{-0.22}$

NGC 4548	inter-arm	$20 . 2_{- 4.7}^{+ 5.4}$ $20.2^{+5.4}_{-4.7}$	$2 . 4_{- 1.1}^{+ 0.9}$ $2.4^{+0.9}_{-1.1}$	$290_{- 66}^{+ 91}$ $290^{+91}_{-66}$	$3 . 3_{- 1.5}^{+ 2.7}$ $3.3^{+2.7}_{-1.5}$	$1 . 2_{- 0.6}^{+ 0.6}$ $1.2^{+0.6}_{-0.6}$	$1 . 3_{- 0.3}^{+ 0.3}$ $1.3^{+0.3}_{-0.3}$	$9 . 0_{- 3.3}^{+ 4.5}$ $9.0^{+4.5}_{-3.3}$	$4 . 39_{- 0.22}^{+ 0.08}$ $4.39^{+0.08}_{-0.22}$
	spiral arm (*)	$10 . 5_{- 2.4}^{+ 6.3}$ $10.5^{+6.3}_{-2.4}$	$1 . 4_{- 0.6}^{+ 1.9}$ $1.4^{+1.9}_{-0.6}$	$178_{- 20}^{+ 38}$ $178^{+38}_{-20}$	$1 . 0_{- 0.4}^{+ 1.2}$ $1.0^{+1.2}_{-0.4}$	$4 . 7_{- 2.3}^{+ 2.3}$ $4.7^{+2.3}_{-2.3}$	$2 . 8_{- 0.6}^{+ 0.6}$ $2.8^{+0.6}_{-0.6}$	$4 . 7_{- 0.5}^{+ 0.6}$ $4.7^{+0.6}_{-0.5}$	$4 . 40_{- 0.21}^{+ 0.08}$ $4.40^{+0.08}_{-0.21}$

NGC 5248	inter-arm	$12 . 9_{- 2.6}^{+ 3.9}$ $12.9^{+3.9}_{-2.6}$	$1 . 8_{- 0.8}^{+ 1.3}$ $1.8^{+1.3}_{-0.8}$	$177_{- 23}^{+ 39}$ $177^{+39}_{-23}$	$3 . 4_{- 1.4}^{+ 2.9}$ $3.4^{+2.9}_{-1.4}$	$4 . 2_{- 2.1}^{+ 2.1}$ $4.2^{+2.1}_{-2.1}$	$7 . 1_{- 1.4}^{+ 1.4}$ $7.1^{+1.4}_{-1.4}$	$9 . 2_{- 1.8}^{+ 2.1}$ $9.2^{+2.1}_{-1.8}$	$4 . 39_{- 0.21}^{+ 0.08}$ $4.39^{+0.08}_{-0.21}$
	spiral arm	$21 . 8_{- 5.4}^{+ 25.6}$ $21.8^{+25.6}_{-5.4}$	$4 . 2_{- 1.6}^{+ 4.8}$ $4.2^{+4.8}_{-1.6}$	$171_{- 42}^{+ 61}$ $171^{+61}_{-42}$	$3 . 4_{- 1.5}^{+ 5.0}$ $3.4^{+5.0}_{-1.5}$	$17 . 8_{- 8.9}^{+ 8.9}$ $17.8^{+8.9}_{-8.9}$	$18 . 5_{- 3.7}^{+ 3.7}$ $18.5^{+3.7}_{-3.7}$	$4 . 9_{- 0.9}^{+ 1.1}$ $4.9^{+1.1}_{-0.9}$	$4 . 39_{- 0.19}^{+ 0.08}$ $4.39^{+0.08}_{-0.19}$

NGC 5643	inter-arm	$17 . 5_{- 4.1}^{+ 15.1}$ $17.5^{+15.1}_{-4.1}$	$2 . 4_{- 1.1}^{+ 3.5}$ $2.4^{+3.5}_{-1.1}$	$194_{- 31}^{+ 73}$ $194^{+73}_{-31}$	$3 . 8_{- 1.6}^{+ 5.0}$ $3.8^{+5.0}_{-1.6}$	$6 . 8_{- 3.4}^{+ 3.4}$ $6.8^{+3.4}_{-3.4}$	$9 . 6_{- 1.9}^{+ 1.9}$ $9.6^{+1.9}_{-1.9}$	$7 . 8_{- 3.0}^{+ 4.3}$ $7.8^{+4.3}_{-3.0}$	$4 . 46_{- 0.20}^{+ 0.08}$ $4.46^{+0.08}_{-0.20}$
	spiral arm	$18 . 4_{- 2.7}^{+ 3.4}$ $18.4^{+3.4}_{-2.7}$	$3 . 4_{- 0.8}^{+ 0.9}$ $3.4^{+0.9}_{-0.8}$	$180_{- 22}^{+ 30}$ $180^{+30}_{-22}$	$4 . 0_{- 1.7}^{+ 3.1}$ $4.0^{+3.1}_{-1.7}$	$8 . 0_{- 4.0}^{+ 4.0}$ $8.0^{+4.0}_{-4.0}$	$11 . 1_{- 2.2}^{+ 2.2}$ $11.1^{+2.2}_{-2.2}$	$6 . 7_{- 1.5}^{+ 1.7}$ $6.7^{+1.7}_{-1.5}$	$4 . 47_{- 0.22}^{+ 0.08}$ $4.47^{+0.08}_{-0.22}$

NGC 6744	inter-arm	$24 . 9_{- 2.6}^{+ 4.5}$ $24.9^{+4.5}_{-2.6}$	$3 . 1_{- 0.5}^{+ 0.8}$ $3.1^{+0.8}_{-0.5}$	$157_{- 13}^{+ 18}$ $157^{+18}_{-13}$	$3 . 8_{- 1.6}^{+ 3.0}$ $3.8^{+3.0}_{-1.6}$	$3 . 3_{- 1.6}^{+ 1.6}$ $3.3^{+1.6}_{-1.6}$	$3 . 3_{- 0.7}^{+ 0.7}$ $3.3^{+0.7}_{-0.7}$	$8 . 7_{- 1.4}^{+ 1.6}$ $8.7^{+1.6}_{-1.4}$	$4 . 33_{- 0.23}^{+ 0.09}$ $4.33^{+0.09}_{-0.23}$
	spiral arm	$42 . 8_{- 4.7}^{+ 9.2}$ $42.8^{+9.2}_{-4.7}$	$5 . 3_{- 0.9}^{+ 1.6}$ $5.3^{+1.6}_{-0.9}$	$152_{- 14}^{+ 21}$ $152^{+21}_{-14}$	$3 . 1_{- 1.6}^{+ 1.6}$ $3.1^{+1.6}_{-1.6}$	$4 . 8_{- 2.4}^{+ 2.4}$ $4.8^{+2.4}_{-2.4}$	$3 . 8_{- 0.8}^{+ 0.8}$ $3.8^{+0.8}_{-0.8}$	$6 . 5_{- 1.0}^{+ 1.1}$ $6.5^{+1.1}_{-1.0}$	$4 . 30_{- 0.20}^{+ 0.09}$ $4.30^{+0.09}_{-0.20}$

Notes. (*) indicates the environments in which the ratio λ/l_ap, min < 1.5, implying that the independent star-forming regions are not sufficiently resolved. In these cases the estimates of t_fb and λ are only 1-σ upper limits, while the estimate of t_CO is unaffected by resolution issues (see section 4.3.6 in Kruijssen et al. 2018). There is a strong bias for this issue to occur preferentially in the spiral arms as the surface density and the number of regions is higher in this environment.

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