Flow chart of the RR Lyrae branch in the SOS Cep&RRL pipeline. As in Fig. 1, rectangles show the differentprocessing modules (with names highlighted in boldface) of this branch. Their outputs are indicated within parallelograms. Rhombi indicate filters leading to different processing options. We mark in light grey modules that were not operational for the Gaia DR2 processing. The figure is updated from Fig. 2 of Paper 1 to include modifications that were implemented to process the DR2 photometry.