Fig. 1
Color-composite (RGB) image of the Cocoon nebula obtained from a combination of wide and narrow band images taken with the Wide Field Camera (WFC) at the 2.5 m Isaac Newton Telescope (only part of the CCD #4 is shown) at the Roque de los Muchachos Observatory. The following color code was used: Hα (red), Hβ (green), B (blue) (credit of the image by Ángel R. López-Sánchez, Australian Astronomical Observatory). The field-of-view of the image is ~11′ × 11′. The position of the slit used to obtain the nebular ISIS at WHT spectroscopy is shown. The PA was 320°. Slit width is not to scale.
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