function scan = optostim_tailmax(scan_file, range)
     if (nargin == 0) 
     disp('usage: optostim_tailmax(filename, range(opt))');
return
end
scan = load(scan_file);
if nargin > 1
    imagesc(scan.x_ticks, scan.y_ticks, scan.max_tail_values, range);
else
    imagesc(scan.x_ticks, scan.y_ticks, scan.max_tail_values);
end
colormap gray;