QC PLOTS
		CURRENT	HISTORY
number of lines/orders found	UVB
	VIS
	NIR
gaps between lines (format check/2D mapping)	UVB
	VIS
	NIR
residuals for format check	UVB
	VIS
	NIR
residuals for order definition	UVB
	VIS
	NIR
residuals for 2D mapping	UVB
	VIS
	NIR
stability of line positions	UVB
	VIS
	NIR
QC1 database (advanced users):
format check		browse | plot
order definition		browse | plot
2D map		browse | plot
Click on CURRENT to see the current trending (Health Check).    Click on HISTORY to see the historical evolution of the trending.

The determination of the distortion correction is done with three types of calibrations: format check (aka 1-pinhole arc), order definition and 9-pinhole arc. In xsh_predict the lines from a catalogue are searched in the format check frame. Their positions are guessed from a prediction by the physical model, which uses a default configuration. By default xsh_predict varies only the parameters affecting 1-pinhole positions (except the distortion parameters) and the allowed ranges of variations are small. Experience showed that for temperature changes above about 2K this approach does not produce good results for UVB. For this arm therefore we allow larger variations, but vary the same parameters. xsh_orderpos uses the updated model configuration to predict the position of the 1-pinhole flat and then fits polynomial relations to the x/y position detected. Finally with xsh_2dmap a 9-pinhole arc is used to also update the distortion coefficientsfrom detected line position. The nine pinhole runs along the direction of the slit length and therefore allow to determine distortions along the slit. Again only small variations are allowed, which works for all 3 arms so far. All three recipes use sigma clipping to improve the stability of the results.

QC1 parameters

• fmt_lines (QC1 database table xshooter_format, column nline_found_clean)
  gives the number of identified lines that remain after sigma clipping.
• gap_fmtchk (QC1 database table xshooter_format, column line_difmax)
  gives the maximum distance between 2 identified lines along any order
• order_fmtchk (QC1 database table xshooter_format, column line_difmax_ord)
  gives the order in which the maximum distance between 2 identified lines occurs
• resid_x_min (QC1 database table xshooter_format, column resx_min)
  gives the minimum residual along the x-axis after the model parameters have been adjusted.
• resid_x_max (QC1 database table xshooter_format, column resx_max)
  gives the maximum residual along the x-axis after the model parameters have been adjusted.
• resid_x_rms (QC1 database table xshooter_format, column resx_rms)
  gives the rms of the residuals along the x-axis after the model parameters have been adjusted.
• resid_y_min, resid_y_max, and resid_y_rms (QC1 database table xshooter_format, columns resy_min, resy_max, and resy_rms)
  give the same information along the y-axis.
• x_lr, y_lr, x_ur, y_ur, x_ll, y_ll, x_ul, and y_ul (QC1 database table xshooter_format, columns x_lr, y_lr, x_ur, y_ur, x_ll, y_ll, x_ul, and y_ul)
  provide the x- and y-positions of isolated lines at the edges of the spectral range

History

• 2010-09-19 new pipeline finds more lines in VIS data
• 2010-01-26 new NIR lamp provides brighter lines

QC1 parameters

• n_order (QC1 database table xshooter_order, column n_order_det)
  gives the number of orders detected by xsh_orderdef. It is compared to the predicted number of orders.
• resid_min (QC1 database table xshooter_order, column resid_min)
  gives the minimum residual after the first fitting (calculated-predicted).
• resid_max (QC1 database table xshooter_order, column resid_max)
  gives the maximum residual after the first fitting (calculated-predicted).
• resid_rms (QC1 database table xshooter_order, column resid_rms)
  gives the minimum residual after the first fitting (calculated-predicted).
• resel_min, resel_max, and resel_rms (QC1 database table xshooter_order, column resel_rms, resel_max, resel_rms)
  give the same information after sigma clipping.

QC1 parameters

• 2dmap_lines (QC1 database table xshooter_2dmap, column nline_found_clean)
  gives the number of identified lines that remain after sigma clipping.
• gap_2dmap (QC1 database table xshooter_2dmap, column line_difmax)
  gives the maximum distance between 2 identified lines along any order
• order_2dmap (QC1 database table xshooter_2dmap, column line_difmax_ord)
  gives the order in which the maximum distance between 2 identified lines occurs
• resid_x_min (QC1 database table xshooter_2dmap, column resx_min)
  gives the minimum residual along the x-axis after model parameters have been adjusted.
• resid_x_max (QC1 database table xshooter_2dmap, column resx_max)
  gives the maximum residual along the x-axis after the model parameters have been adjusted.
• resid_x_rms (QC1 database table xshooter_2dmap, column resx_rms)
  gives the rms of the residuals along the x-axis after the model parameters have been adjusted.
• resid_y_min, resid_y_max, and resid_y_rms (QC1 database table xshooter_2dmap, columns resy_min, resy_max, and resy_rms)
  give the same information along the y-axis.

History

• 2010-09-19 new pipeline versions finds fewer lines in NIR
• 2010-06-01 change in pipeline parameters for VIS provides more lines
• 2010-01-26 new NIR lamp provides brighter lines