[rancid] temperature changes cause diffs to be sent out

[Gary Roberts]

Running rancid 2.3.2a
the router being backed up is a Foundry FastIron SuperX-PREM.
here is sample diff

  ! Fan controlled temperature: 
  ! 	Rule 1/2 (MGMT CARDS THERMAL PLANE): 36.0 deg-C
- ! 	Rule 2/2 (LINE CARDS THERMAL PLANE): 37.2 deg-C
+ ! 	Rule 2/2 (LINE CARDS THERMAL PLANE): 37.7 deg-C
  ! 
  ! Fan speed switching temperature thresholds:
  ! 	Rule 1/2 (MGMT CARDS THERMAL PLANE):
  ! 		Speed 1: NM<----->40                         deg-C
@@ -54,17 +54,17 @@
  ! 		Speed 3:             44<----->52             deg-C
  ! 		Speed 4:                   48<----->55       deg-C
  ! 		Speed 5:                         52<----->80 deg-C (shutdown)
  ! 
- ! Slot 1 Temperature: 36.5 deg-C
- ! Slot 2 Temperature: 38.0 deg-C
+ ! Slot 1 Temperature: 37.0 deg-C
+ ! Slot 2 Temperature: 38.5 deg-C
  ! Slot 3 Temperature: empty
  ! Slot 4 Temperature: empty
  ! Slot 5 Temperature: empty
  ! Slot 6 Temperature: empty
  ! Slot 7 Temperature: empty
  ! Slot 8 Temperature: empty
- ! Slot 9 Temperature: 36.0 deg-C (exhaust side), 31.5 deg-C (intake side)
+ ! Slot 9 Temperature: 36.0 deg-C (exhaust side), 32.0 deg-C (intake side)
  ! Exhaust Side Temperature Readings:
  ! 	Warning level.......: 70.0 deg-C
  ! 	Shutdown level......: 80.0 deg-C
  ! Intake Side Temperature Readings:


it appears that everytime there is a reported temp change in the chassis,  a diff is sent out.
This gets somewhat annoying by days end, Whats the best way to keep the diffs from being sent out on a temp change?

thanks in advance

Gary