If the point t approaches t_0 from the left, the interval does not include the probability mass at t_0 until t reaches that value, at which point the amount at or to the left of t incr...If the point t approaches t_0 from the left, the interval does not include the probability mass at t_0 until t reaches that value, at which point the amount at or to the left of t increases ("jumps") by amount p_0; on the other hand, if t approaches t_0 from the right, the interval includes the mass p_0 all the way to and including t_0, but drops immediately as t moves to the left of t_0.
