Equivalent input noise vs frequency

Hi guys, I have a PCIe-6363, I want to draw a plot of equivalent input noise vs frequency, but I don't know how to do.
Now I collect the signal and display it in labview(pic1). If I want to draw a chart like pic2, what should I do?

The RTA has a Y axis option for volts per √Hz.

Thanks

I have a similar requirement for noise analysis- I need to know the amplitude probability density of a noise source to ensure its adequately random. I use random noise sources to calibrate semiconductor noise analyzers and the ones I have are all very vintage. The pseudo random noise generators would need validation before I can commit to using them as a modern equivalent. This was triggered by this article in edn: "A non-finicky, mass-producible audio frequency white noise generator"