From 5a75b4aca1431663184222b610824b2c5fa9b0fd Mon Sep 17 00:00:00 2001
From: George O'Neill <133203284+ggoneiESS@users.noreply.github.com>
Date: Tue, 13 May 2025 19:06:32 +0200
Subject: [PATCH] Update ev44_events.fbs

going through ev44 today some parts were not very clear, so these have been clarified
---
 schemas/ev44_events.fbs | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/schemas/ev44_events.fbs b/schemas/ev44_events.fbs
index 2a09fa3..c9ed81f 100644
--- a/schemas/ev44_events.fbs
+++ b/schemas/ev44_events.fbs
@@ -7,16 +7,15 @@ table Event44Message {
     message_id : long;                          // Consecutive numbers, to detect missing or unordered messages
     reference_time : [long] (required);         // Nanoseconds since Unix epoch (1 Jan 1970)
                                                 // If pulse times are available in the aquisition system, this field holds
-                                                // those timestamps. Holds wall time otherwise.
+                                                // those timestamps, otherwise it holds system clock time.
     reference_time_index : [int] (required);    // Index into the time_of_flight array for the start of the neutron events linked
                                                 // to the corresponding pulse/reference time.
                                                 // reference_time_index and reference_time are the same length.
-    time_of_flight : [int];                     // Nanoseconds
-                                                // Time of flight for each event if pulse time is available. If not, a
-                                                // (positive) offset from the wall time stored in the `reference_time`.
-                                                // Cannot be empty if events are being sent.
-    pixel_id : [int];                           // Identifiers that represent the positions of the events in the detector(s).
-                                                // Can be empty even when events are sent if the pixel_id is implicit (e.g. single-pixel beam monitor).
+    time_of_flight : [int];                     // Nanoseconds since reference_time
+                                                // An offset from the time stored in the `reference_time`.
+                                                // time_of_flight and pixel_id are the same (implied) length.
+    pixel_id : [int];                           // Identifier that represents the voxel where an event has been detected.
+                                                // Can be empty even when events are sent if the pixel_id is implicit (e.g. single-pixel detector).
 }
 
 root_type Event44Message;