Figure 4. left: data of Ex3 showing intensity against range, separated by target reflectivity. Right: intensity of Ex1-5,
corrected by functions of target reflectivity and angle of incidence. The solid line refers to an exponential model (pow),the dashed line to a logarithmic model. For bins of 2m width the mean value of the corrected intensities, their standard
deviation, and the coefficient of variation are shown. The function f( r ) relates range to intensity.