These files are from data processed through the image acquisition software Digital Micrograph from Gatan.
http://www.gatan.com/products/tem-analysis/gatan-microscopy-suite-software

The three files are in *.dm3 format and represent:
DPC multilayer (Fig 2a in paper) - sensitive to induction component along layer interface with data given as deflection angle
segmented DPC Bx rotated (Fig 3a in paper) - sensitive to induction component along domain wall
pixelated DPC Bx rotated (Fig 3b in paper) - sensitive to induction component along domain wall