void page3() {
  fill(0);
  text("NON-BLOCKING", 310, 20);
  line(50, 350, 650, 350);

  String t = "To the left is the histogram of the non-blocking process. The results for the Incentive Program 1 are shown in red. Those for the Incentive Program 2 are shown in green.";
  drawStrings(t, 700, 50, 25);

  int[] his1 = new int[54];
  int[] his2 = new int[54];
  int a;


  for (int i=0; i<200; i++) {
    a = int((data[i]-75.2)/0.4);
    a = constrain(a, 0, 53);
    his1[a]++;
  }

  for (int i=200; i<400; i++) {
    a = int((data[i]-75.2)/0.4);
    a = constrain(a, 0, 53);
    his2[a]++;
  }

  if (cb1.isSelected()) {
    fill(255, 0, 0);
    for (int i=0; i<54; i++) {
      rect(65+11*i, 350-10*his1[i], 9, 10*his1[i]);
    }
  }

  if (cb2.isSelected()) {
    fill(0, 255, 0);
    for (int i=0; i<54; i++) {
      rect(65+11*i, 350-10*his2[i], 9, 10*his2[i]);
    }
  }

  assign.setVisible(false);
  generate.setVisible(true);
  cb1.setVisible(true);
  cb2.setVisible(true);
  cb3.setVisible(false);
  cb4.setVisible(false); 
  cb5.setVisible(false);
  cb6.setVisible(false);
}