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Fig. 14 :   PYTHEAS scan with PMAS
Scan yourself through a series of continuum flatfield PYTHEAS exposures with etalon spacing increments of 20nm in the wavelength region near 500nm. The picture shows a small fraction of the CCD frame with 9 PMAS spectra in the wavelength region near 500nm. The dark line in the middle serves as a reference. Observe how the Fabry Perot orders which are aligned like pearls on a string move from left to right as the etalon spacing is incremented. Use your browser FORWARD and BACKWARD buttons to step back and forth to better see the effect. Compare later with a similar scan of science exposures targeting the planetary nebula NGC6543.
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Last update September 12, 2004  by  M. Roth