Measured S/Ns for mini-scan-map photometry depending on the number of repetitions. Blue, green, and red symbols represent measurements in the three filters, 70, 100, and 160 μm, respectively. Diamond symbols indicate a scan speed of 20′′/s, triangles a scan speed of 10′′/s. The dotted lines in the respective colours show the S/N prediction by the PACS exposure time calculator of the Herschel observation planning tool HSpot for the measured colour corrected stellar flux. Long dashed red lines indicate the S/N prediction including confusion noise. An exception is the panel of η Dra, where the sets of four dotted, dashed, and dashed-dotted lines represent the sensitivity predictions for four different map parameter combinations; the upper three are with 10′′/s scan speed, the lowest one is with 20′′/s scan speed. For more details, see text.