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> 1) where is the structure 'st' defined for the first time
>    (which file etc.)

spm_orthviews.m

> 2) where, in the code,  are the Blue cross hair lines are plotted over the
>    orthogonal display

The crosshair objects are defined in lines 595-601 of spm_orthviews.m.  Switching between visible
and invisible is done between lines 462-477.

Best regards,
-John

--
Dr John Ashburner.
Functional Imaging Lab., 12 Queen Square, London WC1N 3BG, UK.
tel: +44 (0)20 78337491  or  +44 (0)20 78373611 x4381
fax: +44 (0)20 78131420  http://www.fil.ion.ucl.ac.uk/~john