Parameters

For the storage of control parameters and results, the context LONG uses a number of special keywords. They are intialised by the command SET/CONTEXT LONG, their values can at any time be listed by typing SHOW/LONG. The following table provides a brief description of the purpose of the LONG keywords:

 

ALPHA Rejection parameter for lines matching [0,0.5]

AVDISP Average dispersion per pixel

BETA Non-linearity in mode LINEAR

BIAS Bias image or constant

BIASOPT Bias Correction (YES/NO)

COERBR Table of coefficients for RBR

COMET Combination method (AVERAGE/MEDIAN)

COORFIL Name of coords table of GCOORD/LONG

COROPT Computes correlation

CORVISU Plots correlation peak

DARK Dark image or constant

DARKOPT Dark Correction (YES/NO)

DCX fit degree of the dispersion coeff.

DISPCOE Dispersion coefficients

EXTAB Extinction Table

EXTMTD Extraction method (AVERAGE, LINEAR)

EXTOPT Extinction Correction Option (YES/NO)

FDEG Flat fitting degree

FFIT Flat fitted function

FILTMED Radius of median filter

FILTSMO Radius of smoothing filter

FITD Degree of fit

FITD fit degree of the dispersion coeff.

FITYP Type of fit (POLY, SPLINE)

FLAT Flat-Field Image

FLATOPT Flat Correction (YES/NO)

FLUXTAB Flux Table of the standard star

FVISU Visualisation flag (YES/NO)

GAIN Gain (e-/ADU)

GUESS Guess session name

IMIN lower limit from LINCAT

INPNUMB Input generic name

INPUTF Input generic name

INSTRUME instrument

LINCAT line catalogue

LINTAB Table of line identifications

LOWSKY Lower, upper row number of lower sky

MAXDEV Maximum deviation (pixels)

NITER Number of iterations

NPIX size of the raw images in pixels

OBJECT Lower, upper row number of object spectrum

ORDER Order for optimal extraction

 

OUTNUMB Output starting number

OUTPUTF Output generic name

PLOTYP Type of plot (RATIO, MAGNITUDE)

RADIUS Radius for cosmics rejection

REBEND Final wavelength for rebinning

REBMTD Rebinning method (LINEAR, QUADRATIC, SPLINE)

REBOPT Rebin Option (YES/NO)

REBSTP Wavelength step for rebinning

REBSTRT Starting wavelength for rebinning

RESPLOT Plot flag for response computation

RESPONSE Response Image

RESPOPT Response Correction Option (YES/NO)

RESPTAB Intermediate Response Table

RON Read-Out-Noise (ADU)

ROTOPT Rotation Option (YES/NO)

ROTSTART Y-start after rotation

ROTSTEP Y-step after rotation

SEAMTD Search centering method (GAUSS, GRAV, MAXI)

SESSION Session name

SHIFT Shift in pixels

SIGMA Threshold for rejection of cosmics (std dev.)

SKYMOD Mode of fitting

SKYORD Orderfor sky fit

SMOOTH Smoothing factor for spline fitting

START start points of the raw image.

STD Standard Star Spectrum

STEP start points of the raw image.

THRES Threshold for line detection (above local median)

TOL tolerance in Angstroms for wavelength ident.

TRIM Trim window (x1,y1,x2,y2) in pixels

TRIMOPT Trim Option (YES/NO)

TWODOPT Computes bivariate polynomial option.

UPPSKY Lower, upper row number of upper sky

WCENTER Central wavelength

WIDTH Window size in X for line detection (pixels)

WLC wavelength calibration image

WLCMTD Wavelength calibration method (IDENT,GUESS)

WLCNITER Minimum, Maximum number of iterations

WRANG wavelength range to take from LINCAT

YSTART Starting row for the calibration (pixel value)

YSTEP Step in Y for line searching (pixels)

YWIDTH Window size in Y for line detection (pixels)