Jim,
interesting paper, but I still have not seen convincing evidence that material at chromospheric temperatures travelling upwards gets heated to coronal temperatures. It is clear that all the SDO AIA bands have significant contributions from lines formed below 1 MK (2011,A&A,535, A46) as we discussed at the last loop meeting. Some residual emission above 1 MK might be present but there are a lot of uncertainties..
cheers
Giulio --