\magnification=\magstep0

$$
{\rm Intensity \ } I(\lambda) \quad = \quad C - 
         D e^{ - {(\lambda - \lambda_0)}^2 / {2 \sigma^2} } 
$$

$$
\sigma \quad = \quad { {\rm FWHM} \over {2.35} } 
$$

$$
{\chi}^2 \quad \equiv \quad \sum_{i} { { {({\rm model}_i\ - \ {\rm data}_i)}^2 }
                                \over { ({\rm uncertainty}_i)^2 } } 
$$

$$
{\rm dof \ } \quad \equiv \quad  {\rm (number\ of\ measurements\ )
                     - (number\ of\ parameters\ in\ fit) }
$$

$$
{\rm reduced\ } \chi^2 \quad = \quad { {\chi^2} \over {\rm dof} }
$$

\bye
