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We introduce Zurich Atmosphere Purge (ZAP), an approach to sky subtractionbased on principal component analysis (PCA) that we have developed for theMulti Unit Spectrographic Explorer (MUSE) integral field spectrograph. ZAPemploys filtering and data segmentation to enhance the inherent capabilities ofPCA for sky subtraction. Extensive testing shows that ZAP reduces sky emissionresiduals while robustly preserving the flux and line shapes of astronomicalsources. The method works in a variety of observational situations from sparsefields with a low density of sources to filled fields in which the targetsource fills the field of view. With the inclusion of both of these situationsthe method is generally applicable to many different science cases and shouldalso be useful for other instrumentation. ZAP is available for download athttp://muse-vlt.eu/science/tools.

ZAP -- Enhanced PCA Sky Subtraction for Integral Field Spectroscopy