Histogram of the difference between the surface pressure (Psurface)
and the Rayleigh pressure (Prayleigh). Results of the class 1 (old) algorithm
appear in blue when results for the class-2 (new) algorithm appear in red.

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Mean Rayleigh pressure variation with the viewing angle.

The Rayleigh pressure parameter exhibits "strange" angular behaviour:

for near-nadir observations the pressure suddenly increase. This can be observed for pixels located in the middle of the slot (see blue arrows)
for viewing angles greater than 50°, the retrieved rayleigh pressure can be very different for pixels located West or East of the slot. This leads to discontinuities between two successive overlapping orbits (see red arrow).