Transmission spectra of normal incident polarized light on planar oriented cholesteric layers of CE6 have been measured(1). These measurements can be reproduced very well by the 4-wave model of Belyakov and Dmitrienko(2) using 6 adaptable parameters. A program is written which gives a graphical representation of the calculated spectra. By comparing the experimental spectra with the calculated ones, we determined the 6 adaptable parameters.