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CApphot:NetCountErrT
Returns the value of the theoretically calculated uncertainty in the net count resulting from the photometry measurement. The value returned is the nNetCountErrT class member set my the Measure method
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nNetCountErrT = CApphot:NetCountErrT() |
nNetCountErr is the theoretical uncertainty of the
net count (see NetCount).
The Measure method calculates a theoretical value for the uncertainty of the net count and saves it in the nNetCountErrT member of the class data structure. The value of nNetCountErrT is returned by this method. This value is calculated theoretically, using photon statistics and instrumental parameters. In contrast, the NetCountErr method returns a statistical estimate of the uncertainty based upon noise measured in the background sample rather than relying totally on photon statistics.