Apu, 1. For now use the inst_xry.prm file in \gsas\examples. 2. POLA is appropriate only for X-ray data & not neutron data. GSAS knows the difference. Bob Von Dreele
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Mon 4/26/2004 11:45 AM To: [EMAIL PROTECTED] Hi, I am new to GSAS.I am facing some basic problem and I am confused. # I am using XRD data from Philips PW 1710 machine.How should I prepare the instrument parameter file? #Trying the examples I sometimes fond the option Refine POLA and sometime it was missing.Why it is so? Please help me. Thanks in advance. Regards, Apu **************************************************** Apu Sarkar Research Fellow Variable Energy Cyclotron Centre Kolkata 700 064 phone: 91-33-2337-1230 (extn. 3190) Fax: 91-33-2334-6871 INDIA ****************************************************