   Serial.begin(9600);
   for (byte i = 0; i < NUM_SENSORS; i++)
   {
-    Serial.print(reflectance.calibratedMinimumOn[i]);
+    Serial.print(reflectanceSensors.calibratedMinimumOn[i]);
     Serial.print(' ');
   }
   Serial.println();

  // read calibrated sensor values and obtain a measure of the line position.
  // Note: the values returned will be incorrect if the sensors have not been properly
  // calibrated during the calibration phase.
  unsigned int position = reflectance.readLine(sensorValues);

  // To get raw sensor values instead, call:  
  //reflectance.read(sensorValues);

  for (byte i = 0; i < NUM_SENSORS; i++)
  {

  unsigned long startTime = millis();
  while(millis() - startTime < 10000)   // make the calibration take 10 seconds
  {
    reflectanceSensors.calibrate();
  }
  digitalWrite(13, LOW);         // turn off LED to indicate we are through with calibration

