type 4 inter        -21.08      4.305
type 4 slope    +2.883e-06  5.888e-07
type 2 inter        -20.87      1.083
type 2 slope    +2.854e-06  1.481e-07
type 1 inter        -20.88     0.4882
type 1 slope    +2.855e-06  6.677e-08