2 exchanges confuse pricing, page-8

They do keep pretty much in sync. And even though we don't see chi-x info on nabtrade, they do process trades on that exchange. So if you put your order in on nabtrade, it may be traded on chi-x and you won't see it in the depth or course of sales.

Interestingly, the last time that the asx had a hiccup and was down for a little while, chi-x also stopped trading. I had expected that if one was down, the other would go on trading because I thought that was the point of 2 exchanges, but it seems not.