Trap correction application. The 5.5 ks observation of the Cas A SNR taken in August 2010 in PC mode demonstrates the validity of trap corrections when applied on datasets other than those used to define the trap mapping calibrations. The Si-Kα line has FWHM of 167 ±    10   eV in the observed spectrum and of 135 ±    7   eV after trap corrections derived from Tycho calibration observations from March 2010 are applied.