Update filter.rst

parameters/scoring/filter.rst

@@ -179,11 +179,12 @@ You may specify more than one filter. For example, to score protons with initial
     d:Sc/MyScorer/OnlyIncludeParticlesWithInitialKEAbove = 100. MeV # minimum energy
 
 You can invert the results of all previous filters by adding the InvertFilter::
+
     b:Sc/MyScorer/InvertFilter = "True"
 
 The InvertFilter inverts the final result of the full set of other filters.
 Thus, the following would score only particles that are NOT ( (proton OR neutron) AND have initial KE larger than 100. MeV ).
-Note that the NOT applies to the overall result from the set of other filters::
+Note the double parenthesis after the NOT. The NOT applies to the overall result from the set of other filters::
 
     sv:Sc/MyScorer/OnlyIncludeParticlesNamed = 2 "proton" "neutron"
     d:Sc/MyScorer/OnlyIncludeParticlesWithInitialKEAbove = 100. MeV # minimum energy
@@ -193,18 +194,21 @@ Just to be more clear here: the InvertFilter is applied After all the other filt
 It inverts the Total result of the other filters (rather than inverting them one at a time).
 
 So, if you have filters::
+
     A
     B
 
 Then the result is to allow particles that pass A AND B.
 
 If you have filters::
+
     A
     B
     Invert
 
 Then the result is to allow particles that DO NOT PASS (A AND B)
 which is logically equivalent to::
+
     (NOT A) OR (NOT B)
 
 (see how the And was replaced by an Or here)