Images of 21 cm line emission in the direction of SNR G15.4+0.1. Each map corresponds to the integration of the neutral gas every 8.2 km s-1. The range of velocities is indicated at the top right corner of the panels. The colour display was kept for all images between 633 and 1210 K km s-1. The 0.7 mJy beam-1 contour from the 35′′ resolution 624 MHz image is included in each panel to facilitate the comparison between the radio continuum emission from the remnant and its surroundings.
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