ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

20.10. MAKING CUSTOM FLATS WITH FLAT BUILDER 253
1. You can begin by selecting EXPOSUREs which you want to make up your FLAT. Clearly
it is best to pick those with no signal. Selection is made by clicking on the buttons, located
in the main window under the title click on frame number to select/unselect it.
2. When you have finished the selection, click on SELECTION: DISPLAY to display all
selected EXPOSUREs in the reference window.
3. You can experiment with a median of all the selected EXPOSUREs (click on MEDIAN)
or a mean (click on MEAN). Each time you click the resulting FLAT is displayed in the
display region of the main flat builder window. Also statistical information on your
FLAT and messages will appear in the text sub-windows in the main window.
4. Now click on TEST FLAT (bottom of main window). This applies your FLAT to the
EXPOSUREs and the results are displayed in the reference window.
5. You can also examine row and column profiles of the computed FLAT by clicking on the
button PROFILES. Along with a new plot displaying profiles, the following message will
appear in the CIA command window:
Left mouse button to toggle between rows and columns.
Right mouse button to Exit.
One important note: All other flat builder functions are suspended while profiles are
being viewed. Exit this function by clicking on the FLAT with the right mouse button.
6. You can compare your FLAT with the CAL-G FLAT. Click on CAL-G and then on TEST
FLAT. The CAL-G FLAT is applied to the EXPOSUREs and again, the result is displayed
in the reference window.
7. You can flip back any time to the original EXPOSUREs by clicking DISPLAY OBS. Also,
you can invoke XLOADCT by clicking on xloadct.
When you are finished, click on DONE. Your FLAT will be in the array built flat.
20.10.2 Advanced features
Another great feature of flat builder is that you can choose regions of an EXPOSURE to be
included/excluded from you FLAT. This is useful if you are short of signal-free EXPOSUREs.
1. Choose an EXPOSURE (by clicking the appropriate button under Click on frame number
to select/unselect it!). The selected EXPOSURE is displayed in the main window.
2. With the right mouse button, click on two points on the currently selected EXPOSURE
which enclose the region you desire to be excluded/included.
3. A box will appear outlining the region. Now click on INSIDE or OUTSIDE, depending on
whether you want to include the selected region or exclude it.
4. Click on SELECTION: DISPLAY to display all the selected EXPOSUREs, including the
regions of those partially selected, in the reference window.