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The spectral resolution of the PSPC in the carbon window below 0.28 keV
is 
percent (FWHM). A further subdivision of
the carbon band into two bands is possible, since the boron filter has little
transmission between 0.188 keV and 0.28 keV. The boron filter
itself consists of a carbon film with a coating of boron carbide. The
whole structure is supported by a tungsten wire mesh with a thickness of
m and 4 mm spacing. The filter itself has a diameter of
28 mm. Therefore, only the central portion of the PSPC field of
view is covered; the rest of the field of view is open. In
Figure 4.8 
the transmission of the boron filter as a function of energy is shown.
