Hi Karthik,
A GCR of 0.943 means that the modules are very close together. For the Standard (non-linear) self shading option, SAM includes the shading loss in the "Module deviation from STC" loss category. You could reduce this loss by decreasing the GCR, or reducing the tilt angle.
Please see the documents on the PV Validation page for comparisons between SAM, PVsyst and PV*SOL:
sam.nrel.gov/photovoltaic/pv-validation.html
Best regards,
Paul.