Comparison of the PS sensitivity of the 1FLE catalog and the differential sensitivities of different gamma-ray instruments. The COMPTEL (magenta line) and EGRET (cyan line) sensitivities are given for the typical observation time accumulated during the 9 yr of the CGRO mission. The Fermi-LAT sensitivity (green line) is for a high Galactic latitude source in 10 yr of observation in survey mode. The blue line represents the simulated continuum sensitivity (3σ, 3 yr) for AMEGO. In red, the 1FLE total sensitivity (see also Fig. 2), while the black represents the 1FLE statistical sensitivity determined as the flux corresponding to the 5σ significance of PGWave (Fig. A.9).