MAIN MENU

This controls the interactive use of LONGSLIT, apart from the initial line identification.

The options are:

ADD

Add more lines

IT

Change iteration. This allows reduction of iteration, in order to allow previous fits to be over-ridden (they can also be over-ridden in MANUAL mode fitting).

AUTO

In this mode one defines fits beforehand, and then goes though the lines and cross-sections in order performing the fits. This is the mode of fitting in batch, and ideally should not be carried out interactively.

MANUAL

In this mode one does the fits in whatever order is preferred. This can also be used for checking fits performed in batch mode. The line selected is indicated above the menu. Initially this is line one in the list. MANUAL mode is also driven by a menu:

Line name

to go to that line. By stating the line name, or any unique abbreviation, the line will be set to that selected.

LAST

Move back to previous line in line list.

NEXT

Move on to next line in line list.

TRIM

Limit the range of cross-sections. This is useful for altering the block start/end in window mode (see below)

CHECK

This displays 20 profile plots at a time. At present this will start at the current line, cross-section one, and scan through. When a screen is full, the user is asked whether he/she wants to see the next plots. This is designed for a quick look, before more detailed checking and re-fitting, if that is required. It is also useful to provide a convenient record of the line profiles to refer to, in which case the hardcopy option should be used. Note that if the ``quick plot'' option here (which gives plots of similar quality to softcopy plots) is not used the plots files can be very large.

FIT

Fit this window as it stands

ADVANCE

Go to next WINDOW

BACK

Go to previous window

SEE

Look at individual elements of window

WIDTH

Change window width

SCAN

Scan through windows

OLD

Start/stop plotting old fits

DELETE

Delete fits in this range

HARD

Produce hardcopy of data with fit

EXIT

Return to main menu

DEFINE

Define fits for AUTO mode, for batch or interactive use. This defines fits, either for all the lines at a time, or for each line separately. To define fits differently within a line, use MANUAL mode as described above.

LOOK

Look at values of data cube. This just lists the values in the results array.

TOLS

Apply tolerances. This will reject fits which have, for example, too great a width.

OUTPUT

These options are the main ways of producing output from the program. Selection of this puts the user into the ``OUTPUT MENU'', with the following options:

HARDCOPY

Produce plots of profile fits. The line profile is displayed, together with the fit. It is possible to preview the fits first in softcopy (unless all fits are being plotted, using the option ``plot whole cube''). If the option ``plot whole cube?'' is not being used, then the X-axis of the plots can be in kms$^{-1}$ or Ångstroms, otherwise they are in Ångstroms.

TABLE

Print table of profile parameters

PLOT

Plot rotation curves. Also width v. cross-section and flux v. cross-section plots can be made. All these can be made in softcopy or hardcopy. Also a plot of average velocities v. cross-section will be plotted, if the plot is in hardcopy, and there is more than one line.

PRINT

Print rotation curves

RATIO

Evaluate line ratios

GREY

Produce greyscale plot of data. This is for one line at a time, using the wavelength limits for the line from the initial line location. A velocity scale is plotted on the X-axis.

CONTOUR

This is similar to the GREY option, but uses contours rather than a greyscale image.

FULL

This produces a table suitable for input to a FORTRAN program, including the information from both PRINT and PLOT.

CHECK

This produces an array of line profiles to which successful (or NAG error failed fits if allowed) have been made, with the fits superimposed.

SOFT

This says whether plots are in softcopy (as opposed to hardcopy). This only affects the PLOT, CONTOUR and CHECK options.

VELOCITY

Plot with velocity scale for X axis. This affects the PLOT and HARDCOPY options above.

EXIT

Exit and accept current setting of the options. When any selected plots etc. have been carried out, the user is returned to the main menu.

If the PLOT option is selected the user will be presented with the following menu, to select precisely which plots are required:

VELOCITY

Radial velocities

WIDTH

Widths

FLUX

Fluxes

AVERAGE

Average velocities

ALL

Velocities on 1 plot

EXIT

Exit menu and perform plotting

The output options (except GREY and RATIO) can be given in the command line as keywords. An example of the use of the OUTPUT option is given in section .

SKY

Not yet implemented

SYNTHETIC

Not yet implemented

EXIT

Leave program

CUBAN

Display array of profiles (3-dimensional data only), and move around under cursor control. This is the same as the option in the main menu of FIBDISP (see below).