The Spot metering of highlight and shadow are shown in this
cropped composite image as well as the Matrix metering (that was heavily
influenced by the wall area).A range of 6ev, assuming the spot
metering was correct.
The D700 should be able to take this dynamic range in a single shot,
but as the 400% ev 10 insert images shows, this was not going to be
possible for jpg images to capture good detail at both ends.
The 'highlight' exposure can be ev10 as we can capture detail for 2
more EVs.
The shadow detail can be easily captured by curving a +2ev exposure.
So the minimum is 3 brackets of +/- 1ev centred on ev 9 (8-10 ev).
But for safety a 5 bracket on ev 8 (6 - 10 ev) was taken to ensure
sufficient colour and shadow detail was obtained.