Mid-IR calibrations are discussed in detail on the general mid-IR web pages, as they are generally similar for Michelle and T-ReCS. A baseline calibration set (not charged to the PI) is taken for each observation, generally the minimum calibrations necessary to ensure the utility of the observations in the archive. Wavelength calibration is derived from the telluric lines in the science target and/or calibration spectrum. Special calibrations, e.g. PSF stars, will be charged to the programme. Some discussion of when additional calibrations are useful can be found on the mid-IR strategies page.