A Study of the Temperature gradient in Virgo/M87 with the MECS on board   Beppo-SAX
  Ground and in flight calibrations of the MECS experiment on board Beppo-SAX have demonstrated that this is currently the best X-ray imaging experiment above 3 keV. The MECS on-axis PSF has a half power radius of about 1 arcmin. Moreover due to a fortunate combination of detector and mirror PSFs the total PSF depends only weakly on the energy. Finally the degradation of the PSF with off axis angle is negligible within an off-axis angle of 10 arcminutes. Encouraged by these results we developed techniques to analyze galaxy clusters observed with Beppo-SAX. In this proceeding we quantify spectral distortions introduced by the energy dependent PSF when performing spatially resolved spectroscopy of the core of the Virgo cluster. 
F. D'Acri, S. De Grandi, S. Molendi