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Xscale: Difference between revisions
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== Simple and advanced usage == | == Simple and advanced usage == | ||
[http:// | [http://xds.mpimf-heidelberg.mpg.de/~kabsch/xds/html_doc/xscale_parameters.html XSCALE] is the stand-alone scaling program of the XDS suite. It scales reflection files (typically called XDS_ASCII.HKL) produced by XDS. Since the CORRECT step of XDS ''already scales'' an individual dataset, XSCALE is only ''needed'' if several datasets should be scaled relative to another. However, it does not deterioriate (over-fit) a dataset if it is "scaled again" in XSCALE, since the supporting points of the scalefactors are at the same positions in detector and batch space. | ||
One advantage of using XSCALE for a single dataset is that the user can specify the number and limits of the resolution shells. Another is that zero-dose extrapolation can be done. | One advantage of using XSCALE for a single dataset is that the user can specify the number and limits of the resolution shells. Another is that zero-dose extrapolation can be done. | ||
At the XDS website, there is a short and a long commented example of [http:// | At the XDS website, there is a short and a long commented example of [http://xds.mpimf-heidelberg.mpg.de/html_doc/INPUT_templates/XSCALE.INP XSCALE.INP] | ||
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FRIEDEL'S_LAW=FALSE | FRIEDEL'S_LAW=FALSE | ||
STRICT_ABSORPTION_CORRECTION=TRUE ! see XDSwiki:Tips_and_Tricks | STRICT_ABSORPTION_CORRECTION=TRUE ! see XDSwiki:Tips_and_Tricks | ||
INPUT_FILE= ../fae-rh/xds_2/XDS_ASCII.HKL | ! the star in front of the file name indicates that it is the reference wrt falloff | ||
INPUT_FILE= *../fae-rh/xds_2/XDS_ASCII.HKL | |||
FRIEDEL'S_LAW=FALSE | FRIEDEL'S_LAW=FALSE | ||
STRICT_ABSORPTION_CORRECTION=TRUE | STRICT_ABSORPTION_CORRECTION=TRUE | ||
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=== keywords unique to XSCALE === | === keywords unique to XSCALE === | ||
* REIDX_ISET= ! re-index data from the most recent INPUT_FILE | |||
* MERGE= ! average intensities from all input files, applies to output file | * MERGE= ! average intensities from all input files, applies to output file | ||
* WEIGHT= ! applies to input file | * WEIGHT= ! applies to input file | ||
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* DOSE_RATE= ! (optional for radiation damage correction f.i.r.) | * DOSE_RATE= ! (optional for radiation damage correction f.i.r.) | ||
* 0-DOSE_SIGNIFICANCE_LEVEL= ! (optional for radiation damage correction f.i.r.) | * 0-DOSE_SIGNIFICANCE_LEVEL= ! (optional for radiation damage correction f.i.r.) | ||
* SAVE_CORRECTION_IMAGES= ! Default is TRUE. If FALSE, don't write DECAY*.cbf MODPIX*.cbf ABSORP*.cbf | |||
== Radiation damage correction == | == Radiation damage correction == | ||
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and check the column "ACCEPTED REFLECTIONS". Then remove the dataset(s) with fewest accepted reflections, and re-run the program. Repeat if necessary. | and check the column "ACCEPTED REFLECTIONS". Then remove the dataset(s) with fewest accepted reflections, and re-run the program. Repeat if necessary. | ||
XSCALE makes it explicit which dataset(s) it cannot scale; it prints out e.g. "no common reflections with data set 197". | |||
XSCALE may also finish with the error message !!! ERROR !!! INACCURATE SCALING FACTORS. This usually indicates that one or more datasets are linearly depending on others (this happens if the ''same'' data are included more than once as INPUT_FILE), or are pure noise. | |||