diff --git a/pyzebra/app/panel_ccl_integrate.py b/pyzebra/app/panel_ccl_integrate.py
index 50b0c77..a70b480 100644
--- a/pyzebra/app/panel_ccl_integrate.py
+++ b/pyzebra/app/panel_ccl_integrate.py
@@ -87,8 +87,8 @@ def create():
     proposal_textinput.on_change("value", proposal_textinput_callback)
 
     def _init_datatable():
-        scan_list = list(range(len(det_data["scan"])))
-        hkl = [f'{m["h_index"]} {m["k_index"]} {m["l_index"]}' for m in det_data["scan"]]
+        scan_list = [s["idx"] for s in det_data["scan"]]
+        hkl = [f'{s["h_index"]} {s["k_index"]} {s["l_index"]}' for s in det_data["scan"]]
         scan_table_source.data.update(
             scan=scan_list,
             hkl=hkl,
@@ -290,14 +290,13 @@ def create():
     scan_table = DataTable(
         source=scan_table_source,
         columns=[
-            TableColumn(field="scan", title="scan"),
+            TableColumn(field="scan", title="Scan"),
             TableColumn(field="hkl", title="hkl"),
             TableColumn(field="peaks", title="Peaks"),
             TableColumn(field="fit", title="Fit"),
             TableColumn(field="export", title="Export", editor=CheckboxEditor()),
         ],
         width=250,
-        index_position=None,
         editable=True,
     )
 
diff --git a/pyzebra/app/panel_param_study.py b/pyzebra/app/panel_param_study.py
index 36e1157..5158242 100644
--- a/pyzebra/app/panel_param_study.py
+++ b/pyzebra/app/panel_param_study.py
@@ -96,7 +96,7 @@ def create():
     proposal_textinput.on_change("value", proposal_textinput_callback)
 
     def _init_datatable():
-        scan_list = list(range(len(det_data["scan"])))
+        scan_list = [s["idx"] for s in det_data["scan"]]
         file_list = []
         extra_meta = det_data.get("extra_meta", {})
         for scan_id in scan_list:
@@ -398,7 +398,6 @@ def create():
             TableColumn(field="export", title="Export", editor=CheckboxEditor(), width=50),
         ],
         width=400,
-        index_position=None,
         editable=True,
         fit_columns=False,
     )
diff --git a/pyzebra/ccl_io.py b/pyzebra/ccl_io.py
index 5762923..63ed0be 100644
--- a/pyzebra/ccl_io.py
+++ b/pyzebra/ccl_io.py
@@ -59,7 +59,7 @@ META_VARS_FLOAT = (
 META_UB_MATRIX = ("ub1j", "ub2j", "ub3j")
 
 CCL_FIRST_LINE = (
-    ("scan_number", int),
+    ("idx", int),
     ("h_index", float),
     ("k_index", float),
     ("l_index", float),
@@ -202,7 +202,7 @@ def parse_1D(fileobj, data_type):
         s["phi_angle"] = metadata["phi"]
         s["nu_angle"] = metadata["nu"]
 
-        s["scan_number"] = 1
+        s["idx"] = 1
         scan.append(dict(s))
 
     else:
@@ -231,11 +231,11 @@ def export_1D(data, path, area_method=AREA_METHODS[0], lorentz=False, hkl_precis
     zebra_mode = data["meta"]["zebra_mode"]
     file_content = {".comm": [], ".incomm": []}
 
-    for ind, scan in enumerate(data["scan"]):
+    for scan in data["scan"]:
         if "fit" not in scan:
             continue
 
-        ind_str = f"{ind:6}"
+        idx_str = f"{scan['idx']:6}"
 
         h, k, l = scan["h_index"], scan["k_index"], scan["l_index"]
         if scan["indices"] == "hkl":
@@ -266,7 +266,7 @@ def export_1D(data, path, area_method=AREA_METHODS[0], lorentz=False, hkl_precis
             ang_str = ang_str + f"{scan[angle]:8}"
 
         ref = file_content[".comm"] if scan["indices"] == "hkl" else file_content[".incomm"]
-        ref.append(ind_str + hkl_str + area_str + ang_str + "\n")
+        ref.append(idx_str + hkl_str + area_str + ang_str + "\n")
 
     for ext, content in file_content.items():
         if content:
diff --git a/pyzebra/fit2.py b/pyzebra/fit2.py
index 86519e3..5bfb0ad 100644
--- a/pyzebra/fit2.py
+++ b/pyzebra/fit2.py
@@ -132,7 +132,7 @@ def fitccl(
     try:
         result = mod.fit(y, params, weights=weights, x=x, calc_covar=True)
     except ValueError:
-        print(f"Couldn't fit scan {scan['scan_number']}")
+        print(f"Couldn't fit scan {scan['idx']}")
         return
 
     if result.params["g_amp"].stderr is None:
@@ -192,7 +192,7 @@ def fitccl(
             print("Maximal integration value lower than minimal")
         else:
             pass
-              
+
 
         count_errors = create_uncertanities(y, y_err)
         # create error vector for numerical integration propagation
@@ -217,7 +217,7 @@ def fitccl(
     for pars in result.params:
         d[str(pars)] = (result.params[str(pars)].value, result.params[str(pars)].vary)
 
-    print("Scan", scan["scan_number"])
+    print("Scan", scan["idx"])
     print(result.fit_report())
 
     d["ratio"] = (result.params["g_amp"].value - int_area.n) / result.params["g_amp"].value
diff --git a/pyzebra/merge_function.py b/pyzebra/merge_function.py
index 4f8342c..f82927e 100644
--- a/pyzebra/merge_function.py
+++ b/pyzebra/merge_function.py
@@ -71,9 +71,9 @@ def merge(scan1, scan2):
     scan1["Counts"] = Counts
     scan1["sigma"] = sigma
     if "history" not in scan1:
-        scan1["history"] = str("Merged with scan %d" % scan2["scan_number"])
+        scan1["history"] = str("Merged with scan %d" % scan2["idx"])
     else:
-        scan1["history"] = scan1["history"] + str(", merged with scan %d" % scan2["scan_number"])
+        scan1["history"] = scan1["history"] + str(", merged with scan %d" % scan2["idx"])
     print("merging done")