diff --git a/octoprint_enclosure/BME680.py b/octoprint_enclosure/BME680.py
index c969018..e5eb39f 100644
--- a/octoprint_enclosure/BME680.py
+++ b/octoprint_enclosure/BME680.py
@@ -26,54 +26,54 @@ getgasreference_count = int(0)
 
 
 def GetGasReference(gas_reference):
-  # Now run the sensor for a burn-in period, then use combination of relative humidity and gas resistance to estimate indoor air quality as a percentage.
-  # print("Getting a new gas reference value")
-  readings = int(10)
-  while True:
-    sensor.get_sensor_data()
-    if sensor.data.heat_stable:
-      for i in range(1, readings):  # // read gas for 10 x 0.150mS = 1.5secs
+    # Now run the sensor for a burn-in period, then use combination of relative humidity and gas resistance to estimate indoor air quality as a percentage.
+    # print("Getting a new gas reference value")
+    readings = int(10)
+    while True:
         sensor.get_sensor_data()
-        gas_reference = gas_reference + sensor.data.gas_resistance
-      gas_reference = gas_reference / readings
-      return
+        if sensor.data.heat_stable:
+            for i in range(1, readings):  # // read gas for 10 x 0.150mS = 1.5secs
+                sensor.get_sensor_data()
+                gas_reference = gas_reference + sensor.data.gas_resistance
+            gas_reference = gas_reference / readings
+            return
 
 def CalculateIAQ(score):
-  IAQ_text = "Air quality is "
-  score = float((100 - score) * 5)
-  if score >= 301:
-    IAQ_text = IAQ_text + "Hazardous"
-  elif score >= 201 and score <= 300:
-    IAQ_text = IAQ_text + "Very Unhealthy"
-  elif score >= 176 and score <= 200:
-    IAQ_text = IAQ_text + "Unhealthy"
-  elif score >= 151 and score <= 175:
-    IAQ_text = IAQ_text + "Unhealthy for Sensitive Groups"
-  elif score >= 51 and score <= 150:
-    IAQ_text = IAQ_text + "Moderate"
-  elif score >= 00 and score <= 50:
-    IAQ_text = IAQ_text + "Good"
-  return IAQ_text
+    IAQ_text = "Air quality is "
+    score = float((100 - score) * 5)
+    if score >= 301:
+        IAQ_text = IAQ_text + "Hazardous"
+    elif score >= 201 and score <= 300:
+        IAQ_text = IAQ_text + "Very Unhealthy"
+    elif score >= 176 and score <= 200:
+        IAQ_text = IAQ_text + "Unhealthy"
+    elif score >= 151 and score <= 175:
+        IAQ_text = IAQ_text + "Unhealthy for Sensitive Groups"
+    elif score >= 51 and score <= 150:
+        IAQ_text = IAQ_text + "Moderate"
+    elif score >= 00 and score <= 50:
+        IAQ_text = IAQ_text + "Good"
+    return IAQ_text
 
 #Calculate humidity contribution to IAQ index
 current_humidity = float(sensor.data.humidity)
 if (current_humidity >= 38 and current_humidity <= 42):
-	hum_score = float(0.25*100)  # Humidity +/-5% around optimum 
+    hum_score = float(0.25*100)  # Humidity +/-5% around optimum 
 else:
   #sub-optimal
-  if (current_humidity < 38):
-    hum_score = float(0.25/hum_reference*current_humidity*100)
-  else:
-    hum_score = ((-0.25/(100-hum_reference)*current_humidity)+0.416666)*100
+    if (current_humidity < 38):
+        hum_score = float(0.25/hum_reference*current_humidity*100)
+    else:
+        hum_score = ((-0.25/(100-hum_reference)*current_humidity)+0.416666)*100
 
 #Calculate gas contribution to IAQ index
 gas_lower_limit = float(5000)   # Bad air quality limit
 gas_upper_limit = float(50000)  # Good air quality limit
 
 if (gas_reference > gas_upper_limit):  
-  gas_reference = gas_upper_limit
+    gas_reference = gas_upper_limit
 if (gas_reference < gas_lower_limit): 
-  gas_reference = gas_lower_limit
+    gas_reference = gas_lower_limit
 
 gas_score = float((0.75/(gas_upper_limit-gas_lower_limit)*gas_reference -(gas_lower_limit*(0.75/(gas_upper_limit-gas_lower_limit))))*100)