Schematic view of SRoll2 iterations for building the Stokes I, Q, and U maps for one frequency band. The top box contains the initial improvements of the maps. Step#1 algorithm uses data HPRs to consistently compute the maps, the detector response, and the systematic effects correction parameters other than ADCNL. Step#2 computes the ADCNL correction that is propagated to the subsequent iteration. In the middle box, Step#1 produces maps used as input for Step#2 that computes the ADCNL correction. This whole process is then iterated 19 times. The bottom box is again a Step#1 to build the final maps.