diff --git a/average.py b/average.py
new file mode 100644
index 0000000..893e2f7
--- /dev/null
+++ b/average.py
@@ -0,0 +1,87 @@
+import numpy as np
+from netCDF4 import Dataset
+import warnings
+import glob
+import yaml
+from scipy.io import savemat
+import datetime
+
+warnings.filterwarnings("ignore", category=RuntimeWarning)
+
+def _read_nc(filename, var):
+    # reading nc files without a group
+    nc_f = filename
+    nc_fid = Dataset(nc_f, 'r')
+    out = np.array(nc_fid.variables[var])
+    nc_fid.close()
+    return np.squeeze(out)
+
+def _daterange(start_date, end_date):
+    for n in range(int((end_date - start_date).days)):
+        yield start_date + datetime.timedelta(n)
+# Read the control file
+with open('./control.yml', 'r') as stream:
+    try:
+        ctrl_opts = yaml.safe_load(stream)
+    except yaml.YAMLError as exc:
+        raise Exception(exc)
+
+output_dir = ctrl_opts['output_dir']
+var_perturb = ctrl_opts['var_perturb']
+startdate = ctrl_opts['start_date']
+enddate = ctrl_opts['end_date']
+
+# convert dates to datetime
+start_date = datetime.date(int(startdate[0:4]), int(
+    startdate[5:7]),int(startdate[8:10]))
+end_date = datetime.date(int(enddate[0:4]), int(
+    enddate[5:7]),int(startdate[8:10]))
+
+list_months = []
+list_years = []
+for single_date in _daterange(start_date, end_date):
+    list_months.append(single_date.month)
+    list_years.append(single_date.year)
+
+output = {}
+
+var_perturb.append('org')
+
+for var in var_perturb:
+    OH_pred = np.zeros((361,576,
+        len(range(np.min(list_months),
+                  np.max(list_months)+1)),
+        len(range(np.min(list_years), np.max(list_years)+1))))
+    sens = np.zeros_like(OH_pred)
+    for year in range(np.min(list_years), np.max(list_years)+1):
+        for month in range(np.min(list_months), np.max(list_months)+1):
+            files = sorted(glob.glob(output_dir + '/*' + '_' + str(var) +'_' + '*' + str(year) + f"{month:02}" + '*'))
+            OH_pred_chosen = []
+            sens_up_chosen = []
+            sens_down_chosen = []
+            for f in files:
+                if var == 'org':
+                   print(f)
+                   OH_pred_chosen.append(_read_nc(f,'OH_pred'))
+                else:
+                   if "_up_" in f:
+                       print(f)
+                       sens_up_chosen.append(_read_nc(f,'OH_pred'))
+                   elif "_down_" in f:
+                       print(f)
+                       sens_down_chosen.append(_read_nc(f,'OH_pred'))
+            if var == 'org':
+               OH_pred_chosen = np.mean(np.array(OH_pred_chosen),axis=0)
+               OH_pred[:,:,month - min(list_months), year - min(
+                   list_years)] = OH_pred_chosen
+            else:
+               sens_up_chosen = np.mean(np.array(sens_up_chosen),axis=0)
+               sens_down_chosen = np.mean(np.array(sens_down_chosen),axis=0)
+               sens[:,:,month - min(list_months), year - min(
+                   list_years)] = (sens_up_chosen-sens_down_chosen)/0.20
+    if var == 'org':
+       output[str(var) + '_OH'] = OH_pred
+    else:
+       output[str(var) + '_OH'] = sens
+
+savemat("OH_sens_2010.mat", output)
diff --git a/control.yml b/control.yml
index 74a57e9..e73d8ee 100644
--- a/control.yml
+++ b/control.yml
@@ -8,7 +8,7 @@ debug: False
 ctm_dir: '/css/merra2gmi/pub'
 
 # variables to perturb
-var_perturb: ['NO2','CH2O','O3','QV','GMISTRATO3','ISOP']
+var_perturb: ['NO2','QV','O3','GMISTRATO3','ISOP','CH2O','VOC']
 
 # set the output path
 output_dir: '/discover/nobackup/asouri/PROJECTS/ECCOH/offline_ECCOH/ECCOH_offline/outputs/'
diff --git a/run_xgboost.py b/run_xgboost.py
index a7703b6..34e7715 100644
--- a/run_xgboost.py
+++ b/run_xgboost.py
@@ -30,7 +30,7 @@ def _cal_trop_OH(input, OH):
     M = N_A*PL/R/T
     numerator = np.sum(M*OH*MCH4*K_OH_CH4, axis=0).squeeze()
     denominator = np.sum(MCH4*K_OH_CH4, axis=0).squeeze()
-    return 1e6*numerator/denominator
+    return numerator/denominator
 
 
 def run_eccoh(date:str,var_perturb: list, pertubation: float, output_folder: str):
@@ -52,7 +52,12 @@ def run_eccoh(date:str,var_perturb: list, pertubation: float, output_folder: str
 
         # perturb the target variable
         if var_perturb:
-            input[var_perturb] = input[var_perturb]*pertubation
+            if var_perturb == 'VOC': # a group of compounds
+               VOCs=['ISOP', 'ACET', 'C2H6', 'C3H8', 'PRPE','ALK4', 'CH2O', 'CH4']
+               for voc in VOCs:
+                   input[voc] = input[voc]*pertubation
+            else:
+               input[var_perturb] = input[var_perturb]*pertubation
         print("Reading Completed")
         mask_trop = input["trop_mask"]
         indices_legit = np.argwhere(mask_trop == 1.0)