The accurate flux calibration of the ISO instruments relies on our knowledge about the atmosphere models of stellar standard candles, but the accurate knowledge of these models in turn relies on the high-spectral-resolution observations of these stars, which precisely require ISO. Clearly, then, the final ISO-SWS calibration will result from an iterative process involving both observations of standard stars and interpretation in terms of stellar-atmosphere models. This process will benefit both to the general community interested in a good calibration and to the subcommunity interested in understanding stellar atmosphere models in detail. At the OTAC meeting in September it was agreed to spend 10 more hours on this subject. This proposal has been sollicited accordingly. In the framework of the STARMOD proposal (P.I.: C. Waelkens) standard stars with spectral range going from A0 to M4 are already observed. We now propose to obtain full-resolution SWS scans of a few stellar candles to cover the full K2-M8 spectral range. Stars with an earlier spectral type will be included in the proposal of S. Price.