This is an example of what a conversion diagram looks like. The data visualized here is the product conversion of a fake small webshop.
The first column represents the times a product is shown in the shop, the second how much it has been viewed by a customer and the third how many customers bought the product.
Everything about it is open source and you can find it on github. If you have any questions just drop me an email at sanstream[at]gmail.com.