''2 theta correction due to displacement of capillary from centre of circle in Debye-Scherrer geometry
macro DS_Capillary_SD(x_offset, x_val, y_offset, y_val)
	{
         local x_offset x_val
	 local y_offset y_val
	th2_offset = ((Rad x_offset * Sin(2 Th)) - (Rad y_offset * Cos(2 Th))) / Rs;
	}

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