QC PLOTS
		CURRENT	HISTORY
number of lines, resolution, 9-pinhole vs. slit position	UVB
	VIS
	NIR
QC1 database (advanced users): browse | plot
Click on CURRENT to see the current trending (Health Check).    Click on HISTORY to see the historical evolution of the trending.

The arc lamp exposures with the slit are not used for processing but only for quality control monitoring. The pipeline identifies the lines using the same catalogue as for the distortion correction. Then the resolution and the difference between the position of a given line in the 9-pinhole observations and that in the slit observations is determined. The physical model configuration parameters are not updated.

QC1 parameters

• n_line (QC1 database table xshooter_wavecal, column nline_found)
  gives the number of identified lines.
• resolution (QC1 database table xshooter_wavecal, column resol_med)
  gives the median resolution derived from the identified lines.
• diffy_med (QC1 database table xshooter_wavecal, column model_diffy_med)
  gives the median difference between the y-position of a line in the 9-pinhole frame and its y-position in the arc slit frame. This parameter is a measure for the offset between the slit and the 9-pinhole mask position.
• diffy_rms (QC1 database table xshooter_wavecal, column model_diffy_rms)
  gives the rms of the difference between the y-position of a line in the 9-pinhole frame and its y-position in the arc slit frame. This parameter changed its value (due to new criteria for accepting lines) with pipeline version 1.1.6 (October 2010)

History

• 2011-07-07 new slit mask in NIR: QC parameters may change slightly due to manufacturing tolerances; 0.4" pinhole and 1.5"x11" slit are replaced by 0.6"x11" and 0.9"x11" slits with K-band blocking (resulting in fewer orders and lines for these slits (0.6x11JH, 0.9x11JH) compared to their unblocked equivalents.
• 2011-02-20 Xe lamp in NIR arm replaced; Ne lamp in NIR arm aligned correctly
• 2011-02-15 Ne lamp in NIR arm replaced
• 2010-12-17 Ne lamp in NIR arm dies
• 2010-11-08 - 2010-11-20 pipeline problems with number of accepted lines in NIR
• 2010-10-07 pipeline version 1.1.6 has changed the values of several QC parameters, esp. line intensity, number of lines found and differences with respect to model predictions
• 2010-06-01 UVB lamp provides about 20% more flux; more lines found
• 2010-06-01 VIS lamp provides about 30% more flux; more lines found
• 2010-01-26 new NIR lamp provides brighter lines