Abstract
We have studied the point spread function (PSF) of the Yohkoh Soft X-ray Telescope (SXT) using the pre-launch calibration data. It is revealed from our study that both a careful consideration on the undersampling effect and a proper choice of statistics are indispensable for determining the best fit analytical function for the SXT PSF. We present the results of numerical simulations supporting our approach toward proper handling of the undersampled PSF. Examples of the derived SXT PSF using a limited number of pre-launch calibration data are shown as a case study.
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