The context keywords allow to control the parameters of the reduction process. The keywords can be listed together with their current contents by the command SHOW/FEROS and are set with the command SET/FEROS key=[value].
If the keywords are set to new values, they will only affect the automatic on-line DRS for next incoming files. If one of the files already transfered to the IWS (fero[filenum].mt should be reduced again according to the new settings of the keywords, this is easily achieved by re-starting the @@ autoreduce command manually as follows:
@@ autoreduce fero [filenum]
Useful keywords for the observing session might be:
| Command | parameters |
| INITIALIZE/FEROS | name |
| SAVE/FEROS | name |
| SHOW/FEROS | param |
| SET/FEROS | param=value |
| SAVINIT/FEROS | filename accessmode |
| HELP/FEROS | param |
| KEYDEL/FEROS | |
| DEFINE/FEROS | inimage intable outtable locval thres locpar |
| BACKGR/FEROS | raw flat centab bgmode bgparam medparam fibmode |
| RECTIFY/FEROS | image straightimage centab profilepar |
| EXTRACT/FEROS | straightimage extimage extpar params ccdpar coptab |
| FLAT/FEROS | inspec flatspec outspec |
| SEARCH/FEROS | spec linepar linepos meth linetype |
| CALIBRATE/FEROS | linetab reftab instpar coefftab centertab getcoeffs |
| REBIN/FEROS | extimage linetab rebimage scale step meth |
| MERGE/FEROS | inimage outimage params method |
| TUTORIAL/FEROS |
| Keyword | default value | description |
| RAW_IMG/C/1/80 | flat2d | name of raw image |
| WLC_IMG/C/1/80 | wlc2d | name of wlc image |
| GUESS_TBL/C/1/80 | echpos | name of guess table |
| CENTER_TBL/C/1/80 | centers | name of order position table |
| LOC_CUTSTEP/I/1/1 | 10 | cut step for order definition |
| LOC_WINDOW/I/1/1 | 17 | window size for order definition |
| FIT_DEG/I/1/1 | 5 | order polynomial fit degree |
| LOC_THRES/R/1/1 | 0.9 | background level in order definition |
| LOC_MODE/C/1/1 | G | definition mode; valid values: S,G |
| LOC_METHOD/C/1/1 | R | definition method; valid values: R,A |
| CUTS_IMG/C/1/80 | cuts | cuts image |
| FOLD_IMG/C/1/80 | fold | fold image |
| TEMPL_IMG/C/1/80 | template | input template image |
| TEMPLT_IMG/C/1/80 | templatet | output template image |
| FIT_IMG/C/1/80 | fitted_img | root name if fitted profiles image |
| MASK_IMG/C/1/80 | mask_img | root name of masked pixels image |
| INIT_TBL/C/1/80 | init | init table |
| FLAT_IMG/C/1/80 | nobg2d | name of flatfielded image |
| FLATEXT_IMG/C/1/80 | flatxtrctd | name of extracted flatfield image |
| UNBLAZED_IMG/C/1/80 | unblazed | name of unblazed image |
| BG_MODE/C/1/1 | B | background determination mode; valid values: B,N,S |
| BG_STEPX/I/1/1 | 51 | step in x for background determination |
| BG_STEPY/I/1/1 | 51 | step in y for background determination |
| BG_WIDTHX/I/1/1 | 21 | width in x for background determination |
| BG_WIDTHY/I/1/1 | 45 | width in y for background determination |
| BG_MEDIANX/I/1/1 | 4 | median filter size in x |
| BG_MEDIANY/I/1/1 | 11 | median filter size in y |
| BG_DIST/I/1/1 | 50 | minimum distance between orders |
| STRAIGHT_IMG/C/1/80 | straightened | root name of straightened image |
| PROFILE_W/I/1/1 | 15 | width of spatial profile |
| FIBER_OFF1/I/1/1 | -9 | shift of fiber 1 |
| FIBER_OFF2/I/1/1 | 9 | shift of fiber 2 |
| FIBER_MODE/I/1/1 | 2 | number of fibers |
| IMG_WRITE/C/1/1 | N | write additional images |
| EXT_IMG/C/1/80 | extracted | root name of extracted image |
| Keyword | default value | description |
| SPECTR_TYPE/C/1/1 | G | spectrograph type; valid values: F,G |
| EXT_MODE/C/1/1 | S | extraction mode; valid values: S,O,M |
| PROFILE_GET/C/1/1 | N | get spatial profile from spectrum; valid Y,N |
| EXT_ITER/I/1/1 | 3 | maximum iterations in optimum extraction |
| CCD_RON/R/1/1 | 3.5 | readout noise of CCD (optimum extraction) |
| CCD_GAIN/R/1/1 | 0.66 | gain of CCD (optimum extraction) |
| CCD_THRES/R/1/1 | 4.0 | clipping threshold (optimum extraction) |
| CCD_ROT/R/1/1 | 2.4 | rotation of CCD |
| CCD_SHIFT/R/1/1 | 0.0 | shift of CCD in x direction |
| COEF_COP/C/1/80 | cop_coeff | root name of cross order profile coefficient table |
| COEF_WLC/C/1/80 | wlc_coeffs | root name of wavelength calibration coefficient table |
| INIT_WLC/C/1/1 | C | get dispersion coefficients from spectrum; valid values: G,C,W |
| ORDER_FIRST/I/1/1 | 25 | first order on CCD |
| ORDER_LAST/I/1/1 | 63 | last order on CCD |
| LINE_W/I/1/1 | 5 | width of spectral line |
| LINE_THRES/R/1/1 | 10000 | background level |
| LINE_POS_TBL/C/1/80 | found_lines | root name of found line table |
| LINE_MTD/C/1/80 | gauss | line search method; valid values: GRA,MAX,MIN,GAUSS |
| LINE_TYPE/C/1/80 | emission | line type; valid values: EMIS,ABSORP |
| LINE_REF_TBL/C/1/80 | ThAr50000 | name of laboratory wavelength table |
| ID_ALPHA/R/1/1 | 0.2 | alpha value for line identification |
| ID_TOL/R/1/1 | 0.2 | tolerance value for line identification |
| ID_THRES/R/1/1 | 0.0 | intensity threshold for first step of line identification |
| SPECTR_G/R/1/1 | 79.0 | grating constant (lines/mm) |
| SPECTR_F/R/1/1 | 410.0 | focal length of camera (mm) |
| SPECTR_THB/R/1/1 | 63.4 | blaze angle of spectrograph (degrees) |
| REBIN_IMG/C/1/80 | rebinned | root name of rebinned spectrum |
| REBIN_SCL/C/1/1 | I | scaling of rebinned spectrum (lInear or lOgarithmic) |
| valid values: I,O | ||
| REBIN_STEP/R/1/1 | 0.03 | wavelength step of rebinned spectrum |
| REBIN_MTD/C/1/1 | S | rebinning method; valid values: L,Q,S |
| MERGE_IMG/C/1/80 | merged | root name of merged spectrum |
| MERGE_MTD/C/1/12 | SINC | Merging methods: NOAPPEND,AVERAGE,SINC |
| (Associated command MERGE/FEROS) | ||
| MERGE_DELTA/R/1/1 | 1.0 | Wav. interval to be skipped (MERGE_MTD=AVERAGE) |
| MERGE_ORD/I/1/2 | 0,0 | Ord1,Ord2 (MERGE_MTD=NOAPP). 0,0:all orders |