Figure 1. GA optimized phase modulated shapes for robust π/2 (a) and π (b) rotation pulses of length 5π.

Total evolution times for these pulses are 5 times of the length of hard π pulse with same rf strength (for B₁ = 40KHz, pulse length for GA optimized pulse is 62.5μS). To convert points into time consider that 1 point = 5π/(2π$B_1^0$ × 200).