Hi,
Could anyone please help me to modify the instrument corrections for ISIS HRPD and STOE PSD XRD.

I have GSAS files for them but I am not sure how to modify in Topas.

for ISIS HRPD

GSAS instrument file for backscattering bank is
INS BANK 3
INS FPATH1 95.0
INS FPATH2 95.0
INS FPATH3 95.0
INS HTYPE PNTR
INS 1 ICONS 48283.87 2.09 8.00
INS 1BNKPAR 0.8918 168.33 0.00 .00000 .3000 1 1
INS 1I HEAD HRPD cycle 102 #47564 NBS silicon - backscattering bank
INS 1I ITYP 0 1.000 500.000 2
INS 1PRCF 3 14 0.001000
INS 1PRCF 1 0.183554E+00 0.223152E-01 0.723694E-02 0.000000E+00
INS 1PRCF 2 0.112993E+03 0.170166E+02 0.000000E+00 0.481719E+01
INS 1PRCF 3 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00
INS 1PRCF 4 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00

what should i change here in the Durham Topas template??

TOF_LAM(0.001)
TOF_x_axis_calibration(!t0_bs, 0.27394, !difc_bs, 48213.48769, !difa_bs, -5.50739)
wifd_pkshape(!two_theta, 168.657, !aprm, 2.50000, !tauf_2, 9.80744, !tauf_1, 0.43977, !tauf_0, 0.000, !taus_0, 25.27420, !taus_1, 2.66797, !t_eff, 144.41296, !hhh, 3.58595, !hhh_0, 11.61348)
'TOF_Exponential(!a1_bs, 230.98670,!a2_bs, 27.018, 4, difc_hrpd_bs, +)

and for STOE PSD XRD GSAS instrument file is
INS BANK 1
INS DTYPE STND
INS HTYPE PXCR
INS 1 ICONS 1.540560 0.000000 0.0 0 0.790
INS 1 IRAD 3
INS 1I HEAD dummy incident spectrum for Cu Ka radiation
INS 1I ITYP 0 0.0000 180.0000 1
INS 1PRCF1 3 8 0.01
INS 1PRCF11 1.450000E+01 -.400000E+00 2.110000E+01 0.400000E+00
INS 1PRCF12 0.860000E+00 3.379000E+00 0.000500E+00 0.000500E+00
INS 1PRCF2 3 12 0.01
INS 1PRCF21 0.100000E+03 -.010000E+03 0.350000E+02 0.300000E+00
INS 1PRCF22 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00
INS 1PRFC23 0.000000E+00 0.000000E+00 0.000000E+00 0.000000E+00

Thanks very much