How is th2_offset* defined?
2Th_actual = 2Th_measured + th2_offset
or
2Th_measured = 2Th_actual + th2_offset
or
something else?
Cheary & Coelho define
epsilon = 2Th_measured - 2Th_actual
Is epsilon == th2_offset?
*I know that it should really be x_offset, but most data is 2theta on the x-axis, so....