Add arguments to add rug of var2

https://twitter.com/thosjleeper/status/677582534889365509?t=1&cn=bWVudGlvbg%3D%3D&sig=33ce3becf7a2a4a154663d258858e6d08fe388fe&al=1&refsrc=email&iid=59ffd33c66914e44813d9835a7b922b2&autoactions=1450383240&uid=877758500&nid=4+1489

var names won't match original data, so can't just add a layer. Although maybe best approach is to rename fake so it does match original data

@fsolt since we already have the histogram, why still rug?

Because different people have different preferences? 😜