Figures for the visual grism : clocked mode

These figures go with the description Verification of the flux calibration in the visual grism: clocked mode, and show in the top panel the observed flux and the reference spectrum which is usually taken by HST.

In the bottom panel is plotted (observed - reference)/reference as a percentage. Notice that the bottom plot gets very noisy when the source flux is low. This is due to noise in the data. Also, at longer wavelengths second order contamination raises the observed flux, setting in at a wavelength that depends on the location of the blue rise of the spectrum.

GSPC-P177D spectra (F0 V)

GSPC-P177D Figure 31

This spectrum with anchor at [1281,914].

BPM16274 spectra (DA)

BPM16274 Figure 1

This spectrum with anchor at [1095,1470].

BPM16274 Figure 2

This spectrum with anchor at [1570, 869].

LTT9491 spectra (DB3 White Dwarf)

LTT9491 Figure 1

This spectrum with anchor at [597,628].!!! LOOKS LIKE ERROR IN EXTRACTION !!!

LTT9491 Figure 2

This spectrum with anchor at [885,1408].

LTT9491 Figure 3

This spectrum with anchor at [1485,1326].

GD50 spectra (DA)

GD50 Figure 1

This spectrum with anchor at [900,900].

GD50 Figure 2

This spectrum with anchor at [750,1150].

GD108 spectra (sdB)

GD108 Figure 1

This spectrum with anchor at [1150,1400].