Results for the Herschel field G109.80+2.70. The upper frames show the observed 250 μm surface brightness and the temperature and spectral index maps from the χ² method. The lower frames show the distributions of the (T, β) values obtained with the χ², BM, and HM(N) methods, the colour scale corresponding to logarithmic number of pixels per (T, β) interval. The solid lines are least square fits with the parameters A and B given at the bottom of each frame.