q1_start = 0
q1_end   = 1
N_q1     = 1 

q2_start = 0
q2_end   = 1
N_q2     = 1

p1_start = -10
p1_end   = 10
N_p1     = 128

p2_start = -10
p2_end   = 10
N_p2     = 128

p3_start = -10
p3_end   = 10
N_p3     = 128

N_ghost_q = 0
N_ghost_p = 0
