The “not always” found tiny peak on the downslope of the N term peak seems to give consistent data, reagardless of the fact that it is often not detected as a peak by signal processing or even image filtering techniques. I have seen it in images too many times to ignore it. It lies just between the N term peak and the glycosylation peak in surfactant protein D dodecamers (AFM images, by three researchers in three separate labs). It would be prudent to subject trimers to peak analysis to see if it is seen at the same frequency or whether it has something to do with the N term junctions in surfactant protein D multimers.  So images below show means and other statistical info for analysing the tiny peak width, left hand columns, using all non detected values, right hand columns “NOT” using the missing values.   The addition of 2 and then 4 more dodecamers to the list of those measured follow below in the same organization.
individual data below —  sometimes i find an error, and correct it… so there will be tiny discrepancies between this list and previous lists, but so small as to create little change in the data.