Selected channel maps of the GBT data cube superimposed on corresponding channel maps from the deep VLA data. The GBT data are shown in black contours. Black contours levels are (2.5,5 [ thick contour ] ,10,50) × 10¹⁷ cm^-2. Gray, dashed contours denote −2.5 × 10¹⁷ cm^-2 in the GBT data. The gray-scale shows the H i emission in the deep 30′′ cube from Fraternali et al. (2002). The thin, red contour surronding this emission shows the 5 × 10¹⁸ cm^-2 in these VLA data. The thick, red, dashed contours show the 5 × 10¹⁷ cm^-2 level in the VLA data when smoothed to the GBT resolution of 8.7′. This is the same column density as shown by the thick black contour. None of the VLA contours or gray-scales are corrected for primary-beam effects. The panel in the bottom-right is affected by Galactic emission. The GBT beam is shown in the bottom-left corner of the top-left panel. The two small features to the north of the main emission, as indicated by the thick red contour at v = 258.7 and 243.3 kms s^-1 are data artifacts caused by the severe smoothing.