BASF scale factorsRelative batch scale factors are included in the least-squares refinement based on the batch numbers in the '.hkl' file. For batch number BN, the Fc2 value is multiplied by the (BN-1)'th scale factor from the BASF instruction, as well as by the overall scale factor. For batch number one (or zero), Fc is multiplied by the overall scale factor, but not by a batch scale factor. The least-squares matrix will be singular if there are no reflections with BN=1 (or zero), so the program considers this to be an error. Note that BASF scale factors, unlike the overall scale factor (see FVAR) are relative to F2, not F. For twinned crystals, i.e. when either TWIN or HKLF 5 are employed, BASF specifies the fractional contributions of the various twin components.
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