Normalized sensitivity for the CHIME field of view, including contributions from sky temperature, intensity beam response, masking fraction, DM intrachannel smearing, and scattering. Normalization is done with respect to the peak sensitivity. The map has been rotated 123° in Galactic longitude to horizontally center the north celestial pole. NE2001 is used here for pulse-broadening terms, with YMW16 giving a qualitatively similar map. White dots show the location of the FRBs used in this analysis. The dashed black line shows the extent of the lower transit, where exposure and sensitivity are double-valued (lower transit sensitivity not shown). The concentric circular patterns are due to beam sensitivity (Figure 2) and RFI masking (Figure 3).