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NOTE: There are two conventions for mapping pixels to an image, called "Cartesian" (row/column array indices are x/y) and "matrix" (row/column array indices are y/x) as discussed here:  https://eli.thegreenplace.net/2014/meshgrids-and-disambiguating-rows-and-columns-from-cartesian-coordinates/.  psana uses the Cartesian convention.  This is shown by the following example:

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