This file gives a brief description of all the buttons found on the ISAP GUI. The descriptions are grouped roughly in the same order as the layout of the GUI. The buttons are grouped in different categories according to their functions. The button names terminating with .. indicate that the button is a pull down menu.
For an alphabetical listing of GUI Buttons Click Here
AOT OBJ PRIME
For Bad Data see SWS/LWS BAD DATA
If none of these tags are present in your AAR no buttons are made,
you can simply click on plot and all of your data will be plotted.
If only a single unique value is found for a given tag then the default is that a single button is created and it is automatically switched on. Users should be aware that this means that if only one BAND is present in an SWS data set that the band button will automatically switch on all 12 detectors - you may want to switch the band button off!
If some or all of the above TAGs are present you have to switch-on some or ALL of the buttons in each category. For example you could select SCAN 0, ALL DETRS, LINE 1, SCAN DIRECTION ALL and then click on PLOT. The ALL button toggles all the buttons on' in a given category. If you click on the ALL button a second time it will switch all the buttons off' in that category. For full details of the data TAGS and the corresponding fields in the FITS files see SWS and LWS AAR .
Data Selection Categories:
The pull-down menu for loading data has four options:
EXIT replots your data using your new plot style. The chosen plot style is saved and used for displaying data in this plot window. There are separate plotstyles for each of the plot windows, e.g.: average; rebin, etc.
Introduction - Origin of the LWS Fringes:
Sinusoidal fringes are observed in the LWS spectra of extended sources
and off-axis point sources. They arise due to the interference between
two beams propagating in the instrument with a time delay between them.
The two beams arise from the normal reflection from the field mirror M2
and from the substrate holding M2 which is ~1.45mm behind the front surface
of M2.
Also note: the action of defringing is hardly noticeable in general on the short wavelength LWS detectors: detectors 0-4, because the constant fringe waveform (constant in wavenumber) has a high frequency, is undersampled and nearly impossible to remove. Its removal possible and evident in the log wavelength detectors, detectors 5-9.
The algorithm:
The routine solves for the period, phase and wavenumber dependent
amplitude of a sine wave fitted to the data from a single detector.
Select a detector, remove any lines or spikes using the right mouse button.
Identify your source as either a point source or an extended source. An
extended source is defined to be of diameter > 20 arcsecs. Defringe the
data. Repeat these steps for each detector.
The algorithm handles the two cases, extended and point source like this:
Extended source [and Off-axis point source] case:
The algorithm assumes that the fringing is due to an extended continuum
and line source in the beam (or alternatively an off-axis point source
with no significant extended continuum) The algorithms divides out the
fringe:
[Centered] Point source Case; The algorithm assumes you have a point source emitting spectral line embedded in an extended continuum region (where the extended continuum is causing the fringes). In this case the algorithm subtracts the fringe..
BAND | LINE tag |
---|---|
1A | 911 |
1B | 912 |
1D | 914 |
1E | 915 |
2A | 921 |
2B | 922 |
2C | 923 |
3A | 931 |
3C | 933 |
3D | 934 |
3E | 935 |
4 | 940 |
5A | 951 |
5B | 952 |
5C | 953 |
5D | 954 |
6 | 960 |
A pop-up text widget will appear with the options outlined below.