Half mission difference maps for the 30 GHz channel. The top row shows the Planck data release 3 maps, while the second top row shows the difference for the Planck data release 4 maps. The bottom two rows show BP maps. The third row shows the first sample of a conditional run on astrophysical and instrumental parameters. The bottom row shows the difference between the half mission maps made from two independent runs that sample over the full model. The latter maps are averaged over 50 samples.