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Calibrations

It is important to prepare your calibration tactics before your observing trip. These preparations include

• Selecting the lamps to use at each telescope configuration (see Appendix C).

• Selecting the stars to correct for atmospheric absorptions (F8 stars make good calibrators).

• Selecting the flux standards to use (see Appendix A).

Back home after your trip, and after steps B.1 to B.5 of the reduction, you will be able to use your favourite calibration package. FIGARO, for instance, allows you to calibrate in wavelength in 2-D which is very useful, specially if you are working with extended objects. You can then extract 1-D spectra and 1-D sky to subtract, and you will be ready to eliminate atmospheric absorptions, calibrate in flux and write your papers.