--- a/regression_metrics.xml	Wed May 30 08:26:25 2018 -0400
+++ b/regression_metrics.xml	Tue Jun 05 06:47:21 2018 -0400
@@ -27,18 +27,30 @@
 params = json.load(open(input_json_path, "r"))
 
 header='infer' if params["regression_metrics"]["header1"] else None
+column_option = params["regression_metrics"]["column_selector_options_1"]["selected_column_selector_option"]
+if column_option == "by_index_number":
+    c = params["regression_metrics"]["column_selector_options_1"]["col1"]
+else:
+    c = None
 y_t = read_columns(
         "$regression_metrics.infile1",
-        "$regression_metrics.col1",
+        c = c,
+        c_option = column_option,
         sep='\t',
         header=header,
         parse_dates=True
 )
 
 header='infer' if params["regression_metrics"]["header2"] else None
+column_option = params["regression_metrics"]["column_selector_options_2"]["selected_column_selector_option2"]
+if column_option == "by_index_number":
+    c = params["regression_metrics"]["column_selector_options_2"]["col2"]
+else:
+    c = None
 y_p = read_columns(
         "$regression_metrics.infile2",
-        "$regression_metrics.col2",
+        c = c,
+        c_option = column_option,
         sep='\t',
         header=header,
         parse_dates=True