BEGINNING[BETA_A]  =  10  
BEGINNING[ALPHA_A]=  0    
BEGINNING[BETA_B] =   10
BEGINNING[ALPHA_B] =   0
BEGINNING[ETA_X] =  0
BEGINNING[ETAP_X] =0

PARAMETER[geometry] = open
BEGINNING[E_TOT]  = 5.0E+09


q1: QUADRUPOLE, L=0.6, k1=0.2
q2: QUADRUPOLE, L=0.6, k1=-0.2

d0: DRIFT, L = 2.0
d1: DRIFT, L = 2.0
d2: DRIFT, L = 2.0 
d3: DRIFT, L = 2.0

b1: SBEND, L=4.0, g=1/100.0
b2: SBEND, L=4.0, g=-1/100.0

d0[tracking_method] = time_runge_kutta

erl: line = (q1, b1, d1, q1, d2, b2, d3, q2) 

use, ERL