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Thin foils such as the PSPC entrance window
can be UV transmitting
despite a lexan coating; the UV transmission is concentrated in a
relatively small spectral range around 1700 Å ( 
7eV) where
the mass absorption coefficient of polypropylene has a local minimum.
During the ROSAT calibration phase, the A-type stars 
Leo and
Car were observed for approx. 2000s each and not detected.