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## Selecting the data set to use

In this example we will use the, MEG +1 spectrum (prt = 2 and m=1) which is spectrum id = 10.

> If we know which spectrum we wish to work with in advance then we could load only that spectrum using

> `load_data("acisf1235_000N001_pha2.fits",10);`

> to load the tenth spectrum (MEG order +1). In this case the id for the spectrum would be 1 instead of 10.