Gain of each reading (APS | CHA), by the similarity S used in the STEP. Negative = cheaper.

S in the step                  slope-sign gate               triple by shape      far end by dissimilarity             decision 'defect'   decision 'simpair' (uses S)
tent 1-|z|                 +42 |   -146                -493 |   +205                -122 |   -289                -283 |    -10               +2515 |   -310      
1-sqrt|z|                  +16 |   +167                 -47 |     +9                -186 |    -43                +195 |    -27                 +18 |   -199      
1-|z|^1/3                   +3 |   +186                 -36 |   +139                -776 |   -368                +215 |    +12                +208 |    -50      
1/(1+|z|)                 +165 |    -87                +126 |   +358                -118 |   -327                  +8 |     -8               +3825 |   -432      
(1+|z|)^-2                 +29 |   -158                -255 |   +182                 +29 |   -217                +204 |   -111                 +49 |   -670      
e^-|z|                     +64 |   -203                -227 |   +278                 +30 |   -382                  -2 |     -2               +3194 |   -503      
1/(1+z^2)                   +2 |     +1                 +11 |   +273                  -9 |   -223                 +14 |   -172                 +18 |   -853      
e^-z^2                      +1 |     -3                -224 |   +303                  -8 |   -214                 +14 |   -179                 +10 |   -790      
1/sqrt(1+z^2)               +0 |    +14                +250 |   +186                 -12 |   -211                 -10 |   -171                  +4 |   -844      

Does the gain depend on S?  Range of the gain over the nine functions:
  slope-sign gate                APS     +0 ..   +165    CHA   -203 ..   +186   (over 9 functions)
  triple by shape                APS   -493 ..   +250    CHA     +9 ..   +358   (over 9 functions)
  far end by dissimilarity       APS   -776 ..    +30    CHA   -382 ..    -43   (over 9 functions)
  decision 'defect'              APS   -283 ..   +215    CHA   -179 ..    +12   (over 9 functions)
  decision 'simpair' (uses S)    APS     +4 ..  +3825    CHA   -853 ..    -50   (over 9 functions)