function display_signature(f_name)
%% display_signature(f_name)
%% f_name is a string

FID = fopen(f_name,'r'); %% Open file for reading
if FID >= 0, %% If file is there and it is readable..
  [N,COUNT] = fscanf(FID,' 		%d',1);
  XY = zeros(N,2);
  for i=1:N,
    XY(i,:) = fscanf(FID,'%f',2)';
  end;
  fclose(FID);

  figure(1); plot(XY(:,1),-XY(:,2),'.'); hold on
  figure(1); plot(XY(:,1),-XY(:,2),'g'); hold off
  title(f_name);
else,
  error(['File ' f_name ' either not found or not readable']);
end;