Fig. 4

Multiwavelength and -epoch images of HD 100546. a) NACO polarized light H band (colors) and IRDIS H band (contours). b) ZIMPOL polarized light R′ band (colors) and NACO M′ band (contours). c) ZIMPOL polarized light R′ band after unsharp masking (colors), IRDIS K band (yellow contours), and NACO M′ band (cyan contours). The inset image is the NACO polarized light KS band image from 2006 after unsharp masking. d) IRDIS K band from May 2015 (colors) and NICI K band from March 2010 (contours).
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