
This directory contains the XFilter database.
the program Xfilter will read the environment variable $MID_FILTERS.
This variable indicates the location of this directory. Using this variable,
an advanced XFilter user can define its own instrument by putting the 
new database in his directory and simply doing links to the big databases 
like esofilters or standards.

What are all relevants the sub-directories ? :

atmos/		: transmission curves of the atmosphere and sky spectrum
bc/		: data for boller & chivens
ccd/		: database of CCDs
ctiostd@	: database of ctio standard stars (link to $MID_STANDARD../ctio)
efosc1/		: data for efosc1
efosc2/		: data for efosc2
emmib/		: data for emmi red
emmir/		: data for emmi blue
esostd@		: database of ESO standard stars (link to $MID_STANDARD)
filters/	: the effective database used by XFilter
hststd/		: database of hst standards stars
inst/		: instrument definition data
susi/		: data for susi

emmi/		: original data of both emmi red and blue

atmos:
extatmos.dat	: transmission of the sky
sky_b.dat	: emission of a bright sky without emision lines
sky_b_em.dat	: emission of a bright sky with emision lines
sky_d.dat	: emission of a dark sky without emision lines
sky_d_em.dat	: emission of a dark sky with emision lines

bc:
README
bf_bc.dat	: basic set filters
grating*.dat	: transmission of gratings
mirnew152.dat	: transmission of the 2 mirrors of the 1.52m (new) FAKE curve
mirold152.dat	: transmission of the 2 mirrors of the 1.52m (old) FAKE curve
optbc.dat	: optical transmission of B&C FAKE curve

ccd:
ccd*.tbl	: transmission curves in TBL format of CCDs
ccdchar.tbl	: database of CCDs in TBL format

efosc1:
bf_efosc1.dat	: basic set filters
cdisp1.dat
cdisp2.dat
disp_blue.dat
disp_red.dat
efosc_all.dat	: optical transmission of efosc1
grism_*.dat	: transmission curves of grisms
grism_ori/	: original transmission data of efosc1
mirnew360.dat	: transmission of the 2 mirrors of the 3.60m (new) FAKE curve
mirold360.dat	: transmission of the 2 mirrors of the 3.60m (old) FAKE curve

efosc2:
bf_efosc2.dat	: basic set filters
camera.dat
collim.dat
gr*.dat		: original data (along the 2 axes of polarization)
grism_*.dat	: transmissions curves of grisms used
mirnew220.dat	: transmission of the 2 mirrors of the 2.20m (new) FAKE curve
mirold220.dat	: transmission of the 2 mirrors of the 2.20m (old) FAKE curve
overall.dat	: optical transmission of efosc2
save/		: original transmission data of efosc2

emmib:
bf_emmib.dat	: basic set filters	
dicroic*.dat	: dicroic curves
dimbl.dat	: optics of the blue direct imaging
grating*.dat	: gratings
medbl.dat	: optics of the blue medium dispersion mode
mirnewntt.dat	: transmission of the 3 mirrors of the NTT (new)
miroldntt.dat	: transmission of the 3 mirrors of the NTT (old)

emmir:
bf_emmir.dat	: basic set filters
dicroic*.dat	: dicroic curves
dimr25.dat	: optics of the red direct imaging mode (f/2.5 camera)
dimr53.dat	: optics of the red direct imaging mode (f/5.3 camera)
grating*.dat	: gratings
grism*.dat	: grisms
medr25.dat	: optics of the red medium disp. mode (f/2.5 camera)
medr53.dat	: optics of the red medium disp. mode (f/5.3 camera)
mirnewntt.dat	: transmission of the 3 mirrors of the NTT (new)
miroldntt.dat	: transmission of the 3 mirrors of the NTT (old)

inst:
bc		: definition file of bolcher&chivens
efosc1		:  of efosc1
efosc2		:  of efosc2
emmib		:  of emmi blue
emmir		:  of emmi red
susi		:  of susi

susi:
bf_susi.dat	: basic filters
mirnewntt4.dat	: transmission of the 4 mirrors of the NTT (new)
miroldntt4.dat	: transmission of the 4 mirrors of the NTT (old)
susiopt.dat	: optics transmission of Susi FAKE curve

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NOTES:

- Each instrument has a definition file in inst/. The name of this file must 
  be exactly the same as the one used to keep all the grism/optics/mirrors 
  transmission curves.

- The units used are:

    - nm for wavelength,
    - transmittance for transmission curves: 0 <= t <= 1

   (if it is not the case the program should still work ... but it is much
   better to be homogeneous!!)

If you have any question, send an e-mail to:

filters@eso.org
