diff --git a/hbt/config/hist_hooks.py b/hbt/config/hist_hooks.py
index 4b5d940..0d65cc5 100644
--- a/hbt/config/hist_hooks.py
+++ b/hbt/config/hist_hooks.py
@@ -1,29 +1,30 @@
 import order as od
+import hist
 
 
-def create_regions(id, regions, mc_hist, data_hist, cat_name, cat_parent):
+def create_regions(cat_id, regions, mc_hist, data_hist, cat_name, cat_parent):
     if "os" in cat_name:
-        if "non_iso" in cat_name:
+        if "noniso" not in cat_name:
             regions[cat_parent]["A"] = {}
-            regions[cat_parent]["A"]["mc"] = mc_hist.counts()[id]
-            regions[cat_parent]["A"]["data"] = data_hist.counts()[id]
-            print("...created region A for category " + cat_parent)
+            regions[cat_parent]["A"]["mc"] = mc_hist[{"category": hist.loc(cat_id)}]
+            regions[cat_parent]["A"]["data"] = data_hist[{"category": hist.loc(cat_id)}]
+            print("... created region A for category " + cat_parent)
         else:
             regions[cat_parent]["B"] = {}
-            regions[cat_parent]["B"]["mc"] = mc_hist.counts()[id]
-            regions[cat_parent]["B"]["data"] = data_hist.counts()[id]
-            print("...created region B for category " + cat_parent)
+            regions[cat_parent]["B"]["mc"] = mc_hist[{"category": hist.loc(cat_id)}]
+            regions[cat_parent]["B"]["data"] = data_hist[{"category": hist.loc(cat_id)}]
+            print("... created region B for category " + cat_parent)
     elif "ss" in cat_name:
-        if "non_iso" in cat_name:
+        if "noniso" not in cat_name:
             regions[cat_parent]["C"] = {}
-            regions[cat_parent]["C"]["mc"] = mc_hist.counts()[id]
-            regions[cat_parent]["C"]["data"] = data_hist.counts()[id]
-            print("...created region C for category " + cat_parent)
+            regions[cat_parent]["C"]["mc"] = mc_hist[{"category": hist.loc(cat_id)}]
+            regions[cat_parent]["C"]["data"] = data_hist[{"category": hist.loc(cat_id)}]
+            print("... created region C for category " + cat_parent)
         else:
             regions[cat_parent]["D"] = {}
-            regions[cat_parent]["D"]["mc"] = mc_hist.counts()[id]
-            regions[cat_parent]["D"]["data"] = data_hist.counts()[id]
-            print("...created region D for category " + cat_parent)
+            regions[cat_parent]["D"]["mc"] = mc_hist[{"category": hist.loc(cat_id)}]
+            regions[cat_parent]["D"]["data"] = data_hist[{"category": hist.loc(cat_id)}]
+            print("... created region D for category " + cat_parent)
 
 
 def add_hooks(cfg: od.Config):
@@ -39,33 +40,35 @@ def ana_ABCD(task, hists):
             data_hist = sum(data_hists[1:], data_hists[0].copy())
 
             # check if the number of categories is multiple of 4
-            index = mc_hist.axes[0].size
-            if index % 4 != 0:
+            cat_count = mc_hist.axes[0].size
+            if cat_count % 4 != 0:
                 raise ValueError("Number of categories is not a multiple of 4")
 
             # initialise regions dictionary
             regions = {}
 
-            for id in range(index):
-                # get corresponding category number, name and parent category
-                cat_id = mc_hist.axes[0].value(id)
+            for index in range(cat_count):
+                # get corresponding category id, name and parent category
+                cat_id = mc_hist.axes[0].value(index)
                 cat_name = cfg.get_category(cat_id).name
                 cat_parent = cat_name.partition("_")[0]
+                print("... processing category " + cat_name)
 
                 # define ABCD regions
                 if cat_parent not in regions:
                     regions[cat_parent] = {}
-                    create_regions(id, regions, mc_hist, data_hist, cat_name, cat_parent)
+                    create_regions(cat_id, regions, mc_hist, data_hist, cat_name, cat_parent)
                 else:
-                    create_regions(id, regions, mc_hist, data_hist, cat_name, cat_parent)
+                    create_regions(cat_id, regions, mc_hist, data_hist, cat_name, cat_parent)
 
             from IPython import embed
             embed()
             quit()
+
             # calculate rate factor
             #C_rate = regions[cat_parent]
 
-            hists[cfg.processes.n.qcd] = mc_hist * 0.5
+            #hists[cfg.processes.n.qcd] = B*(D/C)
 
             # calculate rate factor
             # C_rate =