function s = showseg(a,l)
%
% showseg: show selected segment number
% On input:
%     a: 2D array
%     l: segment number
% On output:
%     s: 2D array with just segment l
% Call:
%     s = showseg(a,l)
%

s = lslice(a,[l,230]);
imshow(abs(s-a));
