deletions | additions       diff --git a/res_fitting.md b/res_fitting.md  index 82cb58a..df46ac8 100644  --- a/res_fitting.md  +++ b/res_fitting.md 
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In order to reconstruct the entire image with all the pixels it is also necessary to know the location of the pixels. The parameter vector \(\mathbf{p}_i\) is extended with the coordinates of pixel *i*:  \[  \mathbf{r}_i = \left[\mathbf{p}_i,x_i,y_i\right]  = =\left[A_i, d_i ,\tau_{d,i},\tau_{r,i},\mu_i,x_i,y_i\right] =  \left[\mathbf{p}_{s,i}, \mathbf{p}_{p,i}\]  \]