WHat were the true figures of Tiananmen?

With posts like these popping up all over reddit (for obvious reasons), I'd like to confirm it once and for all with you folks. No doubt violence was committed at Tiananmen square and the whole of Beijing on that day, but the casualty and death figures vary wildly from cable to cable. So I'd like to ask you guys, what is your response to these not so certain figures of the tragedy at Tiananmen?