UVES: Trending query help
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Available trending plots

-: not available
x: available
c: continued from current plot as soon as period is finished

Available settings

Data are available for the UVES standard settings which are defined here. The RED 600 setting only comes in 1x1 unbinned mode, while all others come in 1x1 or 2x2 binnings.

CCD select box

The CCD select box in the trending query is by default set to 'any'. Setting it to either REDU = MIT red chip, or REDL = EEV red chip, selects for the corresponding red CCD. To avoid confusion, BLUE is not offered as an option. If WLEN is set to any value < 500 nm, the proper CCD value (= BLUE) is selected automatically by the query, even if it is set to REDU/REDL. The same is true for the bias query (ARM = BLUE).

General format of ASCII table output

The output tables contain QC1 parameters (quality control level 1, meaning they have been measured by the pipeline in the course of the master calibration creation). Dates and MJD-OBS correspond to the creation date of the corresponding raw frame (or the first raw frame if a stack has been processed). There is always one line per CCD (B - blue, L - red lower, U - red upper).

The output tables of QC1 parameters are primarily designed for further use as computer input. Hence formatting has been restricted to a minimum. To turn them into a flat ASCII table,

- use "Save as" option of your browser
- give the output a name like e.g. "bias_2001_1x1.txt"
- use an editor to remove the HTML tags (all the stuff enclosed by <...>)
- edit (or remove) the header lines.

Entries '-999' stand for unknown values (exception: the unknown rms values of the flat tables are set to '0').

If the query returns "no data available", this will typically happen for a period when the corresponding QC1 parameters have not (yet) been evaluated (see above table).

Columns retrieved

All items

civil_date - Civil date of night of measurement (e.g. 20010823 = August 23, 2001)

mjd_obs - MJD-OBS at start of acquisition

bin - binning X,Y

ins_mode - blue/red: no dichroic filter; DI1, DI2: dichroic filters used

lambda_central - central wavelength (in A) of the setting

slit_width - slit width in arcsec

chip - CCD used (B - blue, U - red upper = MIT, L - red lower = EEV)

BIAS

QC1 parameters measured in: master_BIAS frames
parameters plotted: median_master, sigma (raw, master), struct (X,Y) for all standard settings

median_master - median value of master frame across whole frame

sigma_raw - read noise (raw frame), measured as rms in central 100x100 px window
sigma_master - read noise (master), measured as rms in central 100x100 px window

struct_row - structure in X direction (rms of Y-collapsed master)
struct_col - structure in Y direction (rms of X-collapsed master)

det_out1_conad - conversion factor electrons/ADU (=1/gain)

DISPERSION

QC1 parameters measured in: line tables
parameters plotted: resid_rms for all standard settings

resid_avg - mean value of residuals fit - positions (in milli-angstroem); should be close to 0
resid_rms - rms scatter of residuals (in milli-angstroems)

nlin_tot - number of all lines found
nlin_res - number of lines found with residuals < 0.1 A
nlin_sel - number of lines selected for fit of dispersion relation

RESOLVING POWER

QC1 parameters measured in: line tables
parameters plotted: resol_med vs. MJD-OBS and vs. slit width for all standard settings

resol_med - resolving power (measured as median value over all selected lines)
resol_rms - rms scatter of median value

FLAT STRUCTURE

QC1 parameters measured in: master flats
parameters plotted: noise components RMS vs. MJD-OBS and vs. mean flux MEAN_F for some selected settings

sigma_ph - photon noise (measured as rms in central 100x100 px window of difference frame which has been computed from first two input raw frames

sigma_dx - noise from DX derivative

sigma_dy - noise from DY derivative

mean_master - mean flux in central window of master flat

lamp - lamp used (FF1...4, DEU = deuterium, I2 = FF3 plus absorption cell)

FF LAMP STABILITY

QC1 parameters measured in: master flats
parameters plotted: lamp efficiency vs. MJD-OBS and vs. slit width ( since 2004 two separate plots) for selected settings representative for the flat field lamps FF1, FF2, FF3, FF4, and DEU

mean_master - mean values across master frame

lamp - lamp used (FF1...4, DEU = deuterium, I2 = FF3 plus absorption cell)

ThAr LAMP STABILITY

QC1 parameter measured in line tables
parameter plotted: average intensity of selected lines vs. MJD-OBS (one plot together with FF lamp stability)

int_avg - average ThAr line intensity

nlin_int - number of ThAr lines used for averaging

GRATING STABILITY

QC1 parameters measured in: formatcheck frames
parameters plotted: temperature, X and Y shifts for four settings associated with the four gratings

mean_dx - X shifts between physical model and line positions found
mean_dy - Y shifts

median_shftx - stability test: X shifts between reference frame and actual frame
median_shfty - Y shifts

nlin_all - number of all lines found
nlin_sel - number of lines selected for tests

ins_temp4_mean- temperature (degree Celsius)
ins_press_mean - air pressure

Instrument efficiency (DQE)

QC1 parameters measured in: STD frames
parameter plotted: efficiency at blaze wavelength of central order (BL_EFFC), vs. time and vs. blaze wavelength (BL_WLEN)

max_effic - efficiency at blaze wavelength of central order (=BL_EFFC)
wave_c - blaze wavelength of central order (=BL_WLEN)

airmass - airmass

obs_targ_name - standard star used

Detailed efficiency curve

Same QC1 parameters as above, but per wavelength, and efficiency values at blaze wavelength collected for all echelle orders.

Send comments to <John.Pritchard@eso.org>  Last update: Jan 17, 2004