AHY: This decouples the pressure and temperature profiles so that these are treated as independent. Limb-sounding: retrieved independently without any consideration of altitude spacing Nadir-sounding: use explicit altitude grid for vertical path integrations FIX: The default is to assume that the individual measurements contributing to a limb scan have some relative pointing uncertainty, so that the height/pressure at each tangent point is an independent unknown. With this flag, it is assumed that the relative heights are fixed, and so the hydrostatic equation can be used to reduce the problem to the tangent height/pressure at a single reference level.
FIX: The default is to assume that the individual measurements contributing to a limb scan have some relative pointing uncertainty, so that the height/pressure at each tangent point is an independent unknown. With this flag, it is assumed that the relative heights are fixed, and so the hydrostatic equation can be used to reduce the problem to the tangent height/pressure at a single reference level.