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Ginga Specific Software: Program CLEANALL
Various diagnostics are available to identify "bad" data
in Ginga CUBEs and TIME series. For example, unpredictable
increases in the background, particularly those due to electron
flares, can cause the SUD and PI_MONI rates to depart from the
normally linear relationship. For background data, a similar
correlation exists between the SUD and LAC rates in good quality
data. In addition, data "spikes" can be identified by
comparing adjacent spectral channels in the LAC.
Program cleanall cleans any Ginga CUBE or TIME series
by fitting a straight line to the SUD vs PI_MONI, SUD vs LAC and
LAC vs LAC data. Points which
lie more than CLN_NSIGMA standard deviations off this line are
deleted.
This program can be used to clean both source and background observations,
however if the source is expected to be variable, the SUD vs LAC
correlation should be turned off (see
below).
A Ginga CUBE or TIME series to be cleaned.
A "CLEANed" Ginga CUBE or TIME series.
Cleanall requires four input parameters. The QX parameter
system is used to read these parameters.
| CLN_DATIN | The name of the input file
containing data to be cleaned. |
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| | CLN_DATOUT | The name of the output file
created, containing "CLEANed" data. |
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| | CLN_NSIGMA(3) | The default values of
CLN_NSIGMA are: - CLN_NSIGMA(1)=3.0
(SUD vs PI_MONI)
- CLN_NSIGMA(2)=4.0 (SUD vs LAC)
-
CLN_NSIGMA(3)=5.0 (LAC vs LAC)
Data points which lie more
than CLN_NSIGMA standard deviations from the best-fit
correlation are deleted. The above values have been chosen such that
the majority of "bad" data will be detected with a minimum
of "good" data being deleted by mistake.
Reducing the
value of CLN_NSIGMA increases the sensitivity of
cleanall to "bad" data, but also increases the amount
of "good" data erroneously deleted.
For each
correlation, cleaning can be turned off by setting the appropriate
value of CLN_NSIGMA to zero. Therefore, for variable source
data, CLN_NSIGMA(2)=0.0. |
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| | CLN_DUMP | Controls whether the fit
parameters derived in the correlation are written to the screen. The
default is No, in which case only the number of points deleted
in each correlation will be displayed. |
Cleanall returns one output parameter. The QX parameter
system is used to display this parameters.
| CLN_DATOUT | The name of the output
file containing "CLEANed" data. If no data points were
deleted then CLN_DATOUT returns the name of the input file. |
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