col. #:   (1)  (2)  (3)   (4)      (5)
param:    ID   Amp  sig  sig_bt  S/N_imp

description:
  ID    - ASAS identification
 Amp    - amplitude of brightness change
 sig    - standard deviation of residuals for model without brightness trend
sig_bt  - standard deviation of residuals for model with brightness trend
S/N_imp - relative improvement in signal to noise ratio for model with and without brightness trend (S/N_imp=sig/sig_bt-1)