Effective areas of the X-mode (left-hand panel) and the S-mode (right-hand panel) for the HERMES Pathfinder. Differently colored lines show the effective areas as a function of the boresight angle (as reported in the legend). For the X-mode at angles larger than 60 degrees, the effective area is substantially degraded and is not shown for clarity. Shaded vertical stripes show the energy ranges considered in this study to estimate the detection rates. The full HERMES Constellation is assumed to host detectors with a four-times-larger effective area.