function seamap( X1, X2, Y1, Y2)
%
%  The function seamap( X1, X2, Y1, Y2) makes a cyan square
%  contained in the coordinates X1<x<X1 and Y1<y<Y2, where
%  all the coordinates are in decimal degrees.
%  The subroutine is to be followed by the subroutine map1
%  in order to build maps of archipelagos or oceans.
%
%  See also map1, map2, bwmap1, bwmap2
%
% ------------------------------------------------------------------
%  Written by Vassilis Zervakis, while at
%             AINCO-Interocean, Madrid, Spain, in December 1995
%-------------------------------------------------------------------
%
X = [X1 X1 X2 X2];
Y = [Y1 Y2 Y2 Y1];
fill(X, Y, 'c');
