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# Data Reduction

It is assumed here that the data has been reduced and a spectrum has been extracted. This extracted spectrum can be either a type I spectrum or a type II spectrum (which contains multiple spectra). Below we assume that a type II spectrum has been extracted.

For a more complete discussion on extracting spectra from Chandra data see
`http://asc.harvard.edu/ciao/threads/threads.html`.

- Overview
- Loading the Data into ISIS
- Selecting the data set to use
- The ARF (ancillary response file)
- Examine the data
- Select a Line to Work with