or line-core emission? The case of X5.4-class flare
=============================================================

Almost ending our report we have to discuss the origin of the emission in the SDO/HMI intensitygrams. It is not entirely certain that the $I_{\rm c}$ emission represents a white-light emission. $I_{\rm c}$ is a data product constructed from a set of filtergrams assuming a certain shape of the spectral line as [from @2012SoPh..278..217C] $$I_{\rm c} \equiv \frac16 \sum\limits_{j=0}^5 \left[ I_j + L_{\rm d} \exp\left(-\frac{(\lambda_j-\lambda_0)^2}{\sigma^2} \right)  \right],
\label{eq:ic}$$ where $I_j$ are intensities in each of six filtergrams scanning the iron line with wavelength $\lambda_j$ and $\sigma$ is the line-width.

When the shape of the line is different than assumed, e.g. when the line core is less deep e.g. due to the certain amount of emission in the core, reconstructed $I_{\rm c}$ may also be affected. To shed some light on this issue, we looked at line depth $L_{\rm d}$, another data products available from JSOC.

For a short assessment of this issue we chose the case of the strongest flare in our sample, the X5.4-class flare that occurred on 6th March 2012.

![A context frame of a running-differences movie at the time stamp of 7th March 2012 00:17:15 UT. The flare-kernel 