deletions | additions       diff --git a/usepackage_fixltx2e_As_a_brief__.tex b/usepackage_fixltx2e_As_a_brief__.tex  index 294dd97..02bf405 100644  --- a/usepackage_fixltx2e_As_a_brief__.tex  +++ b/usepackage_fixltx2e_As_a_brief__.tex 
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\end{align*}  \end{flushleft}  where "$I$" refers to the intensity of light, "$\vecr$" "$\vec r$"