block treatment history yield
  B1   A  8.2   287
  B1   B  8.2   271
  B1   C  6.8   234
  B1   D  5.7   189
  B1   E  6.1   210
  B1   S  7.6   222
  B2   A  9.4   290
  B2   B  6.0   209
  B2   C  7.0   210
  B2   D  5.5   205
  B2   E  7.0   276
  B2   S 10.1   301
  B3   A  7.7   254
  B3   B  9.1   243
  B3   C  9.7   286
  B3   D 10.2   312
  B3   E  8.7   279
  B3   S  9.0   238
  B4   A  8.5   307
  B4   B 10.1   348
  B4   C  9.9   371
  B4   D 10.3   375
  B4   E  8.1   344
  B4   S 10.5   357