The GSPC were perfectly throughout the mission.
The energy resolution, DeltaE/E, was 4.5 (E/6 keV)-0.5 % FWHM, approximately a factor of two better than that of the ME.
The peak effective area was around 100 cm2. The energy spectra were divided into 256 pulse height analysed channels. Several different gain modes were used, with the most commonly used, called Gain 1.0, giving an energy window of 2-32 keV while Gain 2.0, covered 2-16 keV.