Dear all, When I do the whole pattern fitting with LS1, then in the preferred orientation option, I get only one parameter that is the ratio of the preferred orientation along that plane.. But when i apply the MD preferred orientation in GSAS, another fitting parameter termed as "fraction" appears when (i give more than one preferred orientation planes). I shall be very much grateful to you if you kindly explain the meaning of this parameter, and advice me if i shld refine those paramters or not.