subplot(311), plot(time, level1), grid on, xlabel('time[sec]'), ylabel('level silo1 [cm]')
subplot(312), plot(time, material_in2), grid on, xlabel('time[sec]'), ylabel('material in silo2 [liter/ec]')
subplot(313), plot(time, level2), grid on, xlabel('time[sec]'), ylabel('level silo2 [cm]')