Imaging the water snowline in a protostellar envelope with H13CO+

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Table 1

Overview of the molecular line observations toward IRAS2A.

Transition	Frequency	E_up∕k	Beam	Δv^a
	(GHz)	(K)	(′′)	(km s⁻¹)
H¹³CO⁺ J = 3 − 2	260.255	25	0.93 × 0.68	0.09
HO 3_1,3 − 2_2,0	203.408	204	0.87 × 0.72	0.115
DCO⁺ J = 2 − 1	144.068	10	2.1 × 1.7	4.06

Notes. ^(a) Velocity resolution.

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