Short wavelengths penetrate slightly deeper into the mesh reflectors.
It amounts to about one F-P resolution element in the worst case and may be neglected for planning of observations. Preliminary data shown here are based on extrapolation from measurements at a few wavelengths. A wavelength range of high leakage has been selected for demonstration. To obtain the effective gap width for a given wavelength, the gap correction has to be added to the gap width for the reference wavelength of 25 m. Both F-P units have gap widths of about 12.500 m.