Thank you but upon close examination you might notice that your link doesn't answers my question in any way (nor any of the links therein).
I got how to read a candlestick chart, what I'm unsure about is related to specifics of btc-e (or at least btc trading), namely :
- The unit of the trade volume bars
- The specific meaning of the four values displayed when highlighting a candlestick. Obviously those are open/close values, but I want to be sure why there are four of them, if it corresponds to the bid/ask or something like that ; moreover, I still don't see which of those four values contribute to determining it there is an upward or downward trend (and hence the color of the stick), and how. Moreover I'm perplexed by the fact that in some cases, the last two values are actually the first two values exactly but in reverse order (like A, B - B, A).
Edit : so I came to the conclusion that this is indeed "Open bid, open ask - close bid, close ask", and that what determines the color is the
closing bid-ask spread. Still not sure about the unit of the trade volume bars, however.