mosflm Help Routines

































































































































TESTGEN


usage:   The TESTGEN option will calculate the maximum allowed oscillation


   angles as a function of the phi value for a given maximum acceptable
  percentage of overlapped reflections (which can be zero).


  It will most commonly be ussed in conjunction with the STRATEGY
  option (qv).


  TESTGEN START phstart END phend STEP phstep MINOSC rotmin MAXOSC rotmax
          OVERLAP x


        START phstart
            Define the starting phi. This keyword MUST be given.


        END phend
            Define the ending phi. This keyword MUST be given.


        STEP phstep
            The optimum rotation angle will be calculated every
            "phstep" degrees between "phstart" and "phend".
            
Default: 5 degrees


        OVERLAP x
            The maximum rotation angle giving less than x% overlapped
            reflections will be calculated. Note that x is in PERCENT.
            Default 0%


        MINOSC rotmin
        MAXOSC rotmax
            Only rotation angles between "rotmin" and "rotmax" will be
            considered.
            
Default: rotmin 0.2, rotmax 5.0


        ANGLE oscang
            If the ANGLE keyword is given, then the overlap for a
            fixed oscillation angle "oscang" is calculated between
            phi=phstart and phi=phend. No attempt to find the "best"
            oscillation angle is made.


  Note that the TESTGEN keyword can be given at the STRATEGY prompt or
  at the normnal MOSFLM prompt (without running the STRATEGY option).
  


    Allows an optimum oscillation angle to be determined to avoid an
  excessive number of spatial overlaps. 


    The program will generate reflection lists for all angles between
  phstart and phend in steps of phstep. For each angle, the MAXIMUM
  oscillation angle which gives fewer than "x" overlaps (where
  x is a PERCENTAGE of the total number of reflections generated)
  will be determined, using oscillations between "oscmin" and
  "oscmax".
  
  The completeness analysis in the STRATEGY option assumes that NO
  reflections are spatially overlapped. Providing that spots within a
  lune (ie in the same plane in reciprocal space) are not overlapping,
  spatial overlaps can usually be reduced to an acceptable level by an
  appropriate choice of oscillation angle for each image.
  
  The determination of whether or not a reflection is spatially
  overlapped depends crucially on the mosaic spread, beam divergence
  parameters and the minimum allowed spot separation. The mosaic spread
  and the minimum spot separation can be reset at the STRATEGY prompt to
  test how critical these values are, using keywords MOSAIC and
  SEPARATION respectively.

  eg TESTGEN START 0 END 90 OVER 1


   Will determine the MAXIMUM oscillation angle between phi=0 and
  phi=90 (in steps of 5 degrees) that give less than 1% overlaps.