import numpy as np
c = np.array(
		[ 15      # (x**0
		, 1      #  x**1
		, -6     #  x**2
		, 0      #  x**3
		, 0      #  x**4
		, 0      #  x**5
		, 0      #  x**6)
		, 1      #       *c*exp(
		, -1     #              c
		, 0      #               (r - c))
		, -1     # + c*exp(
		, -.1    #         c
		, 2      #          (r - c))
		, -4     # + c*exp(
		, -0.05  #         c
		, 40     #          (r - c)**2)
		, 10     # + c*exp(
		, -0.05  #         c
		, 20     #          (r - c)**2)
		, 1]     # dt
		, dtype=np.float16)