Two fits (solid and dash-dotted) to the synoptic observation (dotted) of Fig. 1 (averaged along the slit) using the differential Hanle model. The profiles shown with the solid line were calculated with a magnetic field of 7 G and those shown with the dash-dotted line represent 90 G, both with different scaling factors q. There is apparently no unique set of parameters fitting all lines of both triplets simultaneously.