Oddly, these data don't agree with your data, Your data show multiple spikes up to 3C above current temps. Your 10,000 years occupies one minor division on the horizontal axis of this graph. I see one spike above current temps and it's no more than 1C highers.
http://cdn.antarcticglaciers.org/wp...7/Vostok_420ky_4curves_insolation_to_2004.jpg
http://cdn.antarcticglaciers.org/wp...7/Vostok_420ky_4curves_insolation_to_2004.jpg