Positions of the SPAN512 pointings near the location of the previously known pulsar J2215+5135 (depicted with a red cross). The black contours mark the antenna gain by steps of 0.1 K Jy⁻¹. The colour scale is the same as in Fig. 2. This map shows PSR J2215+5135 falling between beams with a reduced gain on target of 0.23 K Jy⁻¹, explaining its non-detection by the survey. The strip of reduced sensitivity in the top left part of the plot is due to one of approximately 700 non-observed grid pointings.