Update on Overleaf.

main.tex

@@ -534,8 +534,8 @@ license.
    intensity in the front side of the nanoparticle to that in the back
    side normalized to their sum:
    $G_I = (I^{front}-I^{back})/(I^{front}+I^{back})$, where
-   $I^{front}=\int_{(z>0)}|E(z)|^2dv$ and
-   $I^{back}=\int_{(z<0)} |E(z)|^2dv$.  Fig.~\ref{mie-fdtd}(b)
+   $I^{front}=\int_{(z>0)}|E|^2d{\mathrm{v}}$ and
+   $I^{back}=\int_{(z<0)} |E|^2d{\mathrm{v}}$.  Fig.~\ref{mie-fdtd}(b)
  shows the $G$ factor as a function of the nanoparticle size. For the
  nanoparticles of sizes below the first magnetic dipole resonance, the
  intensity is enhanced in the front side as in Fig. \ref{mie-fdtd}(c)