Welcome to the board @yoramoha! Interesting question and the link that @JerryM provided answers your questions. What is your objective? Are you actively trading or just have interest in the market? TTT
You already asked that, and we don't understand your question. A few answers were given to try to take a stab at what you're asking, but it's extremely unclear what exactly you are asking. Could you give us a more detailed question so we can try to help you out?