Hi,
        Aaron just pointed out to me (and I checked it and confirm) that 
the polarity of the magnetic field in the data file bgrid.blast which Abi 
Goodhue produced is for out-bending electrons (ie opposite to the way we 
normally run).  So if we use this data file anywhere to analysis you must 
remember to take the negative of the components or vector.
        The magnetic field points down in the left sector and up in the 
right sector for in-bending electrons which is our normal operating mode.
                                                  Cheers,
                                                          Douglas
26-415 M.I.T.                                Tel: +1 617 258 7199
77 Massachusetts Avenue                      Fax: +1 617 258 5440
Cambridge, MA 02139, USA                   E-mail: hasell@mit.edu
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