next previous contents
Next: The Mask Fabrication Process
Previous: Preliminary Reduction

3.2.2 The Extractions

You are now ready to begin the extractions. If you can combine your object frame at this point, it will save you a fair amount of work; use imcombine. However, if you've tweaked the telescope between individual exposures you should first check using implot that the objects line up exactly. If not, you should treat your frames separately and combine after they are extracted. For the purposes of this outline we will assume that you have three object frames ( object1, object2, object3), one quartz-lamp frame ( flat1), and one comparison spectrum ( comp1). We assume that you are starting with "fresh" parameters, i.e., the default settings of specred, and explicitly refer only to parameters that we would change.



next previous contents
Next: The Mask Fabrication Process
Previous: Preliminary Reduction

kessel@noao.edu
Fri Jun 23 09:48:03 MST 1995