Table 2: Summary of uncertainties attributed to the theoretical atmosphere spectra in the 2-200 $ \mu$m range at a resolution $ \lambda$/$ \Delta$$ \lambda$ $ \sim$ 100.
Description Uncertainty Spectral type Wavelength region

$ \bullet$ dependency on stellar parameters

      
$ \rightarrow$ molecular features up to 8% G-K around 2.3, 4.0, 4.2, 8 $ \mu$m

$ \rightarrow$ continuum

 up to 4% A-M 2-200 $ \mu$m

$ \bullet$ uncertainties on T($ \tau$)

      

continuum flux (without high-resolution data constraints)

 $ \la$3.5% A-M 2-200 $ \mu$m

continuum flux (with high-resolution data constraints)

 1-2% A-M 2-200 $ \mu$m

$ \bullet$ presence of chromosphere/ionized wind

 $ \ga$10% G-M $ \lambda$ > 100 $ \mu$m

presence of circumstellar dust

 $ \ga$10% A-M $ \lambda$ > 2 $ \mu$m

$ \bullet$ continuous opacity by H -ff

 1% A-M 2-200 $ \mu$m

$ \bullet$ line lists

 $ \la$3% A0-M0 2-200 $ \mu$m
  1-2% A0-M0 near-IR
OVERALL BUDGET: for approved standards $ \sim$3% A0-M0 mid-IR
with high-resolution data constraints $ \sim$5% A0-M0 far-IR


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