Add offline keys definitions

display offline file keys definitions and units from aanet version 2 documentation

README.rst

@@ -111,10 +111,28 @@ Offline files contain data about events, hits and tracks.
 
 .. csv-table:: events keys definitions and units
    :header: "type", "name", "definition"
-   :widths: 20, 20, 40
+   :widths: 20, 20, 80
 
     "int", "id", "offline event identifier"
     "int", "det_id", "detector identifier from DAQ"
+    "int", "mc_id", "identifier of the MC event (as found in ascii or antcc file)"
+    "int", "run_id", "DAQ run identifier"
+    "int", "mc_run_id", "MC run identifier"
+    "int", "frame_index", "from the raw data"
+    "ULong64_t", "trigger_mask", "trigger mask from raw data (i.e. the trigger bits)"
+    "ULong64_t", "trigger_counter", "trigger counter"
+    "unsigned int", "overlays", "number of overlaying triggered events"
+    "TTimeStamp", "t", "UTC time of the start of the timeslice the event came from"
+    "vec Hit", "hits", "list of hits"
+    "vec Trk", "trks", "list of reconstructed tracks (can be several because of prefits,showers, etc)"
+    "vec double", "w", "MC: Weights w[0]=w1 & w[1]=w2 &  w[2]]=w3"
+    "vec double", "w2list", "MC: factors that make up w[1]=w2"
+    "vec double", "w3list", "MC: atmospheric flux information"
+    "double", "mc_t", "MC: time of the mc event"
+    "vec Hit", "mc_hits", "MC: list of MC truth hits"
+    "vec Trk", "mc_trks", "MC: list of MC truth tracks"
+    "string", "comment", "user can use this as he/she likes"
+    "int", "index", "user can use this as he/she likes"
 
 
 DAQ files reader