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ligo-skymap-plot now uses multi-resolution HEALPix natively

Leo P. Singer requested to merge leo-singer/ligo.skymap:plot-moc into main

Enhancements to the command-line tool ligo-skymap-plot:

  • Read in and reproject sky maps in multi-resolution format. This significantly decreases memory consumption when plotting high-resolution sky maps.

  • The algorithm that calculates credible areas printed in the plot legend now matches the algorithm in ligo.skymap.postprocess.crossmatch: it does linear interpolation of area when the credible level falls between pixels.

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