H I channel maps of HIJASS J1021+6842 (every other channel is shown, primary beam attenuation has not been applied). The gray scale displays a range from 0 to 9 mJy beam⁻¹. The beam size (﹩60^{\prime \prime }\times 52^{\prime \prime }﹩) is indicated in the lower left of the top left panel. Note that the channel maps at around 0 km s⁻¹ are affected by large‐scale Galactic H I emission.