Similar to Fig. D.1, but comparing two epochs for the same Be star (25 Cyg). The black (respectively red) triangles in the left panels indicate spectra from NRES (respectively DAO). The same colours are used in the middle panels for data from the two telescopes. The green line in the bottom-middle panel is the average of the NRES Hα profile taken during Sector 41 (i.e. during an emission-free phase).