*6.20 In order to investigate the operation of the npn transistor in saturation using the model of Fig. 6.9, let IS = 10−15 A, vBE = 0.7 V, β =100, and ISC/IS = 100. For each of three values of vCE (namely, 0.4 V, 0.3 V, and 0.2 V), find vBC, iBC, iBE, iB, iC, and iC/iB. Present your results in a table. Also find vCE that results in iC = 0.