I realize that now. The plot you mention was supposed to be and is now in my last post.
For the record, I did mention that the AD8336 could be the problem when I first did the measurement, and no one jumped up to say THAT IS A SHITTY PART! Of course, I am to blame for not looking at the data sheet.
I thought you guys know that, as it's clearly mentioned in the datasheet, in the table on page 2 and in graphs where noise is plotted vs gain setting voltage some pages later. Nobody ever said that this is a low-noise part.