Exemplary observational run in 700mm camera

   1. Login on the computer alhena as tcsuser and start XWindows.
   2. Start the observational user interface via the command observe and confirm that none graphical application is running (Netscape, xv, gimp etc. - they may be started later than the observational user interface.)

The user interface consist of four windows (Bias CCD Control, Bias CCD Status, Coude Spectrograph and Sao Image for Bias)

Remark on the slit of the spectrograph: The slit is permanently opened up to 17mm, so don't be disoriented if the Coude Spectrograph window depicts zero slit width.

Now, we summarize the most important commands of the BIAS as they follows during the typical observational run.

observer Slechta, Fuchs
   - identification of observers. Blank letter is allowed, maximally 20 letters.

run halfa
   - pre-definition of values (grating angle, number of dichroic mirror and spectral filter, exposure time of flat field and comparison spectra) for H_α region.

   Available pre-defining scripts are:

script	Grating Angle	Spectral Range	Dich. Mirror &	Exposure Time
	o   '	(Å)	Spectral Filter	FF/Thar
halfa	30:15	6261 - 6773	1/1	10/40
hbeta	38:45	4755 - 5007	2/5	100/100
hgama	36:10	4271 - 4525	2/5	250/250
infra	36:00	8477 - 8985	2/3	15/100
NaD	28:40	5640 - 6153	1/1	10/40
theta2tau	41:00	5170 - 5420	2/5	100/100
mgii	36:45	4381 - 4634	2/5	100/100
europium	34:58	4042 - 4296	2/5	250/250

comp
   - the command securing the comparison spectrum; we use the Thorium - Argon lamp. It is not necessary to fill in the exposure time if we have used any mentioned script. Otherwise we write comp⊔40.

object gamma Cas
   - notation of the object to be exposed. Blank letters are allowed.

exp 15
   - exposure time in seconds.

addtime 20
   - add time in seconds. Final exposure time thus will be 35 seconds. It is possible to put negative number in order to shorten the exposure time.

   Using the exposuremeter:

pexp 5.0
   - the total signal to be accumulated in exposuremeter is adjusted to 5 Megacounts. The chip is read out when the signal exceeds this value.

exp -e
   - starting the exposition. The end of exposition is driven by the signal of exposuremeter instead of time.

readout
   - end of exposition; the spectrum will be saved.

abort
   - end of exposition; the file will not be saved and spectrum will be lost.

mflat 10 5
   - 5 flat fields will be exposed; exposure time of each flat is 10 seconds. The exposure time is the obligatory parameter independently on auxiliary scripts (halfa, europium etc. - see table)

   We recommend to use mflat command instead of many flat because the flat field lamp shines continuously and all flats are more stable.

mzero 0 5
   - five zeros is exposed. The first parameter (i.e. 0) denotes the exposure time as the auxiliary parameter The second parameter denotes the number of files to be exposed. (see also mflat command).

exit
   - end of observation.

For example, observational run in Septermber 27/28th, 2003 was following:

observe   ENTER
observer Slechta,Kalas
run halfa
comp
object Gam Cas
exp 15
exp 60
object Omi Cas
exp 120
comp
run mgii
comp
exp 150
exp 3000
comp
object b Per
exp 4000
comp
object Omi Cas
exp 600
comp
run halfa
comp
exp 120
exp 400
object b Per
exp 500
object X Per
exp 500
comp
object Rho Aur
exp 1200
comp
object EW Lac
exp 250
exp 600
object Zeta Tau
exp 80
mflat 10 10
run mgii
mflat 250 4
mzero 0 10
exit