On Nilanga's suggestions, I made a cut on the central sieve hole, and plot tg_th to find out the peak shift due to target field; and the resulting dp peaks shifts due to scattering angle change. #2725, straight through, C12 in LHe, unrastered beam #2921, 2.5T target field, C12 in LHe, unrastered beam
2725, tg_th
2921, tg_th
2725, tg_dp
2921, tg_dp