Interstellar emission along the BM Cas line of sight. With the exception of the 408 Mhz image in the lower right-hand corner, the images cover 0﹩\mathop{.}\limits^{\unicode{x000b0}}﹩6 × 0﹩\mathop{.}\limits^{\unicode{x000b0}}﹩6. North is at the top, and east is to the left. The location of BM Cas is indicated with a star. The H I and CO data in the CGPS cover a range of wavelengths, and the data cubes have been collapsed to produce an integrated signal along the line of sight. A 408 MHz image that covers a larger area is also shown to enable a search for large-scale structures in the ISM near BM Cas. While BM Cas is located in an area of moderate emission from gas and hot dust, the line of sight passes through the Galactic disk, and so depth effects are significant.