col. #:   (1)  (2)  (3)  (4)  (5)  (6)  (7) 
param:    ID  HJD_0  w   dw   w_c  a_c  b_c

description:
  ID  - ASAS identification
HJD_0 - corrected Heliocentric Julian Date of primary minimum
  w   - corrected angular frequency
 dw   - linear change of angular frequency dw/dt
 w_c  - angular frequency of cyclic period change
 a_c  - amplitude of sine term in cyclic period change
 b_c  - amplitude of cosine term in cyclic period change

phase of light curve for given time 't_obs' can be calculated as:
  fi = w*t + 0.5*dw*t^2 + a_c*sin(w_c*t) + b_c*cos(w_c*t)
where:
  t = t_obs - HJD_0