The Fabry-Pérot spectral resolution
has been measured at a few discrete
wavelengths using solid state laser sources. Fig. 
shows
the spectral resolution as a function of wavelength, interpolated between
these measurements. The spectral resolution decreases towards the short
wavelength ends of the wavelength ranges covered by the two Fabry-Pérots,
where the wavelengths corresponding to the resonances of the reflective
meshes are approached.
Figure: SWS Fabry-Pérot spectral resolution as a function of
wavelength, computed from measured mesh properties and confirmed by checks
at selected wavelengths
The Fabry-Pérot spectral resolution depends on precise parallelity of the
F-P plates. An in-orbit spectral resolution very close to
Fig. is however expected after execution of the in-orbit
parallelisation procedure of the SWS F-P.