Table 2: Results of the spectral analysis.
GRB  $N_{\rm H}$ Gal.a $N_{\rm H}$ obs.b $\chi^2_{\rm red}$
  $10^{20}\rm\ cm^{-2}$ $10^{20}\rm\ cm^{-2}$ (d.o.f.)
041223 10.9 (9.9) [5.6] $\rm 16.8^{+5.2}_{-4.2}$ 0.8 (26)
050124 5.2 (2.6) [1.7] $\rm 6.2^{+3.9}_{-2.5}$ 1.3 (35)
050126 5.3 (3.2) [2.6] $\rm 4.1^{+2.7}_{-2.6}$ 0.9 (10)
050128 4.8 (4.9) [3.8] $\rm 12.5^{+1.4}_{-1.3}$ 1.3 (105)
050215b 2.1 (2.0) [0.9] <3.4 1.0 (4)
050219a 8.5 (10.1) [8.1] $\rm 30.1^{+6.5}_{-5.9}$ 1.0 (57)
050219b 3.8 (3.0) [1.7] $\rm 23.8^{+4.0}_{-3.7}$ 1.0 (98)
050223 7.1 (6.6) [4.4] $\rm 9.5^{+23.8}_{-7.3}$ 1.2 (3)
050306 3.1 (2.9) [3.5] $\rm 46.1^{+35.6}_{-28.8}$ 1.0 (3)
050315 4.3 (3.3) [2.5] $\rm 14.9^{+3.9}_{-2.2}$ 1.3 (42)
050318 2.8 (1.8) [0.9] $\rm 4.2^{+1.9}_{-1.5}$ 0.8 (39)
050319 1.1 (1.2) [0.5] $\rm 3.0^{+0.9}_{-0.8}$ 1.3 (29)
050326 4.5 (3.8) [1.8] $\rm 18.9^{+7.1}_{-6.0}$ 1.0 (25)
050401 4.8 (4.4) [3.3] $\rm 21.1^{+2.2}_{-1.8}$ 1.0 (297)
050406 2.8 (1.7) [1.1] <6.6 1.2 (10)
050408 1.7 (1.5) [1.3] $\rm 30.7^{+5.5}_{-4.9}$ 0.9 (45)
050412 2.2 (1.7) [1.0] $\rm 26.4^{+14.9}_{-12.4}$ 1.4 (11)
a Column density values are from Dickey & Lockman (1990). Values between parentheses are from Kalberla et al. (2005) and in square parentheses from Schlegel et al. (1998), using the usual conversion $N_{\rm H}=5.9\times 10^{21}~E(B-V)\rm\ cm^{-2}$.
b The values of the column density have been computed at z=0 since we do not have any knowledge of the GRB redshift for most of them (but see Table 2).

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