Support for custom files does not support actual merging
Specifying the custom_dataset option in analyze_sd.py does offer a merging, but the two data sets are not manipulated, they are just stitched together. The expected result should be an actual merging of size distribution data, where the datasets are shifted based on their respective measure type of particle diameter. This is currently not the case.
The expected result should be the same for custom datasets as well as datasets queried from the database server.