Table 1:

Radio sample.

Name	d		D		Ref.
	(Mpc)	(cm-3)	(pc)
He 2-10	10.4	10 000	6.4	8.06	1, 9
		3300	6.4		1
I Zw 18	14.6	4	626	7.17	3, 10
II Zw 40	11.1	35 000	1.1	8.13	3, 10
M 33	0.84	3700	3.7	8.78	5, 17
Mrk 8	52.5	20 000	3.7	8.51	4, 13
Mrk 33	25.5	9000	1.9	8.40	4, 14
Mrk 1089	54.6	20 000	3.9	8.04	4, 12
Mrk 1236	29.6	20 000	0.5	8.07	4, 16
NGC 4214n	3.8	70 000	0.4	8.22	4, 11
NGC 5253	2.5	7500	2.7	8.17	1, 8
		40 000	0.9		2
NGC 6946	5.6	3700	9.9	9.12	5, 15
NGC 253	3.4	10 000	3.3	8.88	5, 17
Pox 4	52.5	7000	2.6	7.95	4, 14
SBS 0335-052	53.7	1500	22.7	7.30	6, 10
SBS 0335-052-1	53.7	4300	9.6	7.30	7, 10
SBS 0335-052-2	53.7	7900	5.4	7.30	7, 10
Tol 35	25.2	20 000	0.5	8.11	4, 15
VII Zw 19	67.4	5000	4.8	8.71	4, 14

References for the radio interferometric observations: 1) Mohan et al. (2001); 2) Turner et al. (2000); 3) Beck et al. (2002); 4) Beck et al. (2000); 5) Johnson et al. (2001); 6) Hunt et al. (2004); 7) Johnson et al. (2009);  references for the oxygen abundance: 8) Walsh & Roy (1989); 9) Vacca & Conti (1992); 10) Thuan & Izotov (2005); 11) Kobulnicky & Skillman (1996); 12) Guseva et al. (2000); 13) Shi et al. (2005); 14) Kunth & Joubert (1985); 15) Kobulnicky et al. (1999); 16) Buckalew et al. (2005); 17) Garnett (2002);  the distance of M 33 is taken from Freedman et al. (1991).