Difficult datasets

Small-molecule and low resolution protein datasets have few reflections per frame. The following parameters then may be adjusted (typical values are given):

1. NBATCH=2  ! to reduce the number of scale factors
2. DELPHI=45  ! to base reflection profiles and refinements on more reflections
3. REFINE(INTEGRATE)= ! do not refine anything

It may be tried to recycle GXPARM.XDS to XPARM.XDS, and to grab the lines e.g.

BEAM_DIVERGENCE=   2.067  BEAM_DIVERGENCE_E.S.D.=   0.207
REFLECTING_RANGE=  2.303  REFLECTING_RANGE_E.S.D.=  0.329

from INTEGRATE.LP and to insert them into XDS.INP .