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The Multi-Unit Spectroscopic Explorer (MUSE) has enabled a renaissance of theplanetary nebula luminosity function (PNLF) as a standard candle. In the caseof NGC 300, we learned that the precise spectrophotometry of MUSE was crucialto obtain an accurate PNLF distance. We present the advantage of the integralfield spectrograph compared to the slit spectrograph in delivering precisespectrophotometry by simulating a slit observation on integral fieldspectroscopy data. We also discuss the possible systematic shift in measuringthe PNLF distance using the least-square method, especially when the PNLFcutoff is affected by small number statistics.

Precision spectrophotometry for PNLF distances: the case of NGC 300