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 |   -106                -493 |   +194                -122 |   -315                -283 |    -10               +2515 |   -310      
1-sqrt|z|                  +16 |   +226                 -47 |    -17                -186 |    -65                +195 |    -34                 +18 |   -206      
1-|z|^1/3                   +3 |   +188                 -36 |   +131                -776 |   -359                +215 |     +8                +208 |    -58      
1/(1+|z|)                 +165 |    -24                +126 |   +361                -118 |   -354                  +8 |     -8               +3825 |   -407      
(1+|z|)^-2                 +29 |   -100                -255 |   +175                 +29 |   -235                +204 |   -111                 +49 |   -641      
e^-|z|                     +64 |   -145                -227 |   +276                 +30 |   -404                  -2 |     -2               +3194 |   -473      
1/(1+z^2)                   +2 |     +1                 +11 |   +275                  -9 |   -300                 +14 |   -146                 +18 |   -825      
e^-z^2                      +1 |     -3                -224 |   +321                  -8 |   -294                 +14 |    -77                 +10 |   -767      
1/sqrt(1+z^2)               +0 |    +14                +250 |   +192                 -12 |   -264                 -10 |   -107                  +4 |   -778      

Does the gain depend on S?  Range of the gain over the nine functions:
  slope-sign gate                APS     +0 ..   +165    CHA   -145 ..   +226   (over 9 functions)
  triple by shape                APS   -493 ..   +250    CHA    -17 ..   +361   (over 9 functions)
  far end by dissimilarity       APS   -776 ..    +30    CHA   -404 ..    -65   (over 9 functions)
  decision 'defect'              APS   -283 ..   +215    CHA   -146 ..     +8   (over 9 functions)
  decision 'simpair' (uses S)    APS     +4 ..  +3825    CHA   -825 ..    -58   (over 9 functions)