diff --git a/config/lab4.ini b/config/lab4.ini
index 07023ff..4791db9 100644
--- a/config/lab4.ini
+++ b/config/lab4.ini
@@ -1,4 +1,4 @@
 [chart]
 T_stat=K_3
-T_stat.raw=unit
-T_nvd.raw=unit
\ No newline at end of file
+T_stat.raw=+
+T_nvd.raw=+
\ No newline at end of file
diff --git a/influxdb.py b/influxdb.py
index ed641d4..af0672d 100644
--- a/influxdb.py
+++ b/influxdb.py
@@ -351,13 +351,13 @@ class InfluxDataGetter:
                         variable = {
                             "name":name,
                             "label":content[1]["secop_module"],
-                            "params":{"value":{"cat":"unit", "color":"", "unit":value_unit}} # main value, shown by default
+                            "params":{"value":{"cat":"+", "color":"", "unit":value_unit}} # main value, shown by default
                         }
 
                         for param_name, param_content in content[1]["params_cfg"].items():
                             param_unit = "1" if (not "unit" in param_content.keys() or param_content["unit"] == "") else param_content["unit"]
                             variable["params"][param_name] = {
-                                "cat":"unit" if param_name == "target" else "None", # target is also shown by default, not the other parameters
+                                "cat":"+" if param_name == "target" else "-", # target is also shown by default, not the other parameters
                                 "color":"",
                                 "unit":param_unit
                             }
@@ -417,7 +417,7 @@ class InfluxDataGetter:
         for variable in available_variables:
             params = list(variable["params"].keys())
             for param_key in params:
-                if variable["params"][param_key]["cat"] == "None":
+                if variable["params"][param_key]["cat"] == "-":
                     del variable["params"][param_key]
                     
         return available_variables
@@ -472,7 +472,7 @@ class InfluxDataGetter:
 
         for available_variable in available_variables:   
             key = available_variable["unit"]
-            if available_variable["cat"] != "unit":
+            if available_variable["cat"] != "+":
                 key = available_variable["cat"]
             if key not in groups.keys():
                 groups[key] = {"tag":key, "unit":available_variable["unit"], "curves":[]}