I'm trying to plot $\sin(x)/x$ and fill the positive side. How do I achieve that? I know how to fill the entire axis. Here's what I have:

```
Show[Plot[Sin[x]/x, {x, -2 π, 2 π}, Filling -> Axis], 
 AxesLabel -> {HoldForm[Distance from Slit], HoldForm[Amplitude]}, 
 PlotLabel -> HoldForm[Single Slit Difraction]]

```