

  Chris,

  just to clarify the point: there is no real varied scan parameter! nhist
  is more like an order number. Basically we are doing a rotation camera
  type of experiment: the detector is put at some two theta. Then the crytal
  is rotated a bit, a frame collected, the crystal moved a bit, new frame
  collected etc. Then the detector is put at another two theta and the first
  step repeated. 

  Now, in contrast to the standard rotation camera described above, TRICS
  has a few specials: we will have three detectors in the end, not one.
  There is another degree of freedom, as we can move each detector 
  individually on a sphere around the crystal. The most efficient measurement
  procedure for this setup has still to be developed once the thing is doing
  something at all(and all detectors are availbale). Given this situation
  I need to have all relevant angles with each frame  in order to calculate
  individual transformation matrices for each detector in the first step
  of data evaluation.

  As this is at it is, the nhist is just a physically meaningless storage
  order. First frame collected is number 1, second no2 etc... Depending on
  the measurement scheme finally developed there may be no physical 
  correlation between adjacent frames at all.

  This is why I got to treat each frame individually. BTW: should this four
  circle issue go into the general NeXus mailing list?


                                         Mark
                      

