function [yoff, unit]=yoffset(header)
%YOFFSET Return the image Y offset

%
% Copyright (c) 1995 by Claudio Rivetti and Mark Young
% claudio@alice.uoregon.edu,    mark@alice.uoregon.edu
%

ss=getparameter(header, 'Y offset',1);

[scan_num,unit]=strtok(ss, ' ');

yoff= str2num(scan_num);

return