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xray [<xq>]
This command sets the Q-value used to calculate the scattering
length used in the PDF calculation. The default value is xq=0
which results in a weight corresponding to the number of electrons
of the contributing atoms. Other settings could be the Q value
of the first Bragg peak or the average Q value of the data set.
Calling the command without parameters prints the current setting
on the screen.
Thomas Proffen {Billinge}
1999-07-20