It is in a graphical form, both low and high speed buffet. An article i business News and Aviation, january this year, was about Coffins Corner, exactly on this aeroplane. The weird thing is that the ADC shows IAS and not EAS - that gives you a false indication of being safe - stalling at 180 knots ? I knew about the IAS-EAS compressibility factor, but why is it not placarded or warned more ? Anyway, now I know, you don't want to get below 190 at FL450.
By the waym this would not as much be coffins corner, as there were still M .69 to M .79 to increse spead, that is about a 60 knot margin.