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Дата изменения: Wed Jul 2 12:49:36 2008
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XMM-Newton Science Analysis System


bkgfit (ebkgmap-1.2) [xmmsas_20080701_1801-8.0.0]

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Parameters

This section documents the parameters recognized by this task (if any).

Parameter	Mand	Type	Default	Constraints
poissonset	yes	dataset
The name of the Poissonian image which it is desired to fit background to.
fitsets	yes	dataset list
List of names of datasets, each of which is an image which represents one of the components of the background model to be fitted.
fitstyle	no	string	whole	whole|base|wholethenbase
If fitstyle=`whole', the pixels of poissonset may have any value, and a standard Poisson distribution is assumed. If fitstyle=`base', only pixels which have values below a truncation level are included in the fit: in this case the probability distribution is necessarily a (renormalized) Poisson distribution which extends only from zero to the truncation level. The second type of fit is useful if there are bright patches on the image which it is desired to exclude.
truncationset	yes	dataset
This parameter is read if fitstyle=`base'. It should point to a dataset which has in its primary extension an image, of the same pixel dimensions as poissonset, fitsets or any other image input to the task. The task interprets this as an image of cutoff values: only those pixels of poissonset which have values below the corresponding value of truncationset will be fitted to the task; the probability distributions at those pixels being similarly truncated.
withmaskset	no	bool	no
If `yes', the task reads the name of a mask image from maskset. Only unmasked pixels (that is, pixels for which the mask evaluates to TRUE) are fitted.
maskset	no	dataset	mask.ds
The name of the mask image dataset.
withinitcoeffs	no	bool	no
If `yes', the task reads starting values of the amplitudes $\mathbf{a}$ from initcoeffs. If withinitcoeffs=`no', the task estimates these itself.
initcoeffs	no	real list	1.0
A list of starting values of the amplitudes $\mathbf{a}$. This is only read if withinitcoeffs=`yes'. There must be the same number of elements in this list as in fitsets.
outbkgmapset	no	dataset	outset.ds
The name of the output image dataset.
Parameter	Mand	Type	Default	Constraints