Table 2: Definition of the method of measurement of 21-cm line width. The columns are arranged as follows: Col. 1: number of published 21-cm line widths; Col. 2: code number of the method in LEDA; Col. 3: description of the method.
n code Definition of the level

20 684 5 50% of the maximum

17 546 1 20% of the maximum

4702 8 50% of the mean

3067 10 $2V_{\rm M}^{\sin i}$ from rotation curve

1503 4 40% of the maximum

1268 2 25% of the maximum

1069 6 20% of the mean

731 9 mean of codes 1 and 8

395 7 25% of the mean

139 0 undetermined

51 113 total

**Table 2:** Definition of the method of measurement of 21-cm line width. The columns are arranged as follows: Col. 1: number of published 21-cm line widths; Col. 2: code number of the method in LEDA; Col. 3: description of the method.
n	code	Definition of the level
20 684	5	50% of the maximum
17 546	1	20% of the maximum
4702	8	50% of the mean
3067	10	$2V_{\rm M}^{\sin i}$ from rotation curve
1503	4	40% of the maximum
1268	2	25% of the maximum
1069	6	20% of the mean
731	9	mean of codes 1 and 8
395	7	25% of the mean
139	0	undetermined
51 113		total

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