fout.writeDouble(left_t);
fout.writeDouble(bottom);
fout.writeDouble(left_b);
fout.writeDouble(top);
fout.writeDouble(right_t);
fout.writeDouble(bottom);
fout.writeDouble(right_b);
fout.writeDouble(group.v_resolution);
fout.writeDouble(group.h_resolution);
fout.writeDouble(group.v_interval);