(a) from equations (3) to (4), with δ = 1, 2, 4, 10, 20. (b) from equations (3) to (7), with δ = 1, 1.5, 2, 2.5, 3.
from equations (3) to (4), with δ = 1, 2, 4, 10, 20. (b) 
from equations (3) to (7), with δ = 1, 1.5, 2, 2.5, 3.
