Temporal distribution of the residual background measurements in BP spectra. Each column in the heatmap shows the measurements within a given OBMT day for each OBMT day. The OBMT revolution is shown on the top abscissa axis for ease of interpretation. The high-residual features are the Galactic Plane crossing the two FoVs either in the Galaxy inner or outer direction (see the text for more details). The gaps related to major events such as decontamination and refocussing are visible. Other small gaps are due to telemetry data that could not be included in the processing for various reasons.