The curve of the absolute value of a first order term s has a 20 dB/decade slope crossing the horizontal axis at w = 1. The phase of this term is 90 ° at any frequency. The curve of K* s also has a 20 dB/decade slope but it crosses the axis at w = 1/K i.e., where the absolute value of the product ½ K* s ½ = 1. Similarly, the absolute value of the term K/ s has a -20 dB/decade slope the phase is -90 ° at any frequency but it crosses the w axis at w = K, where the absolute value of the fraction The next first order term (in the second example), s -1 = 1/s, is similar: its absolute value has a -20 dB/decade slope its phase is -90 ° at any frequency and it crosses the w -axis at w = 1. The next first order term to sketch is 1+sT. The amplitude plot is a horizontal line until w 1 = 1/T, after which it slopes upward at 20 dB/decade. The phase equals zero at small frequencies, 90 ° at high frequencies and 45 ° at w 1 = 1/T. A good approximation for phase is that it is zero until 0.1* w 1 = 0.1/T and is nearly 90 ° above 10* w 1 = 10/T.