## 3 Results and Discussion
Thus, urban and suburban environments may not differ significantly as far as such sources are considered. Box-and-whisker plots, per environment type, for the total electric field strength and the total exposure ratio are depicted in Figure 2. Plots considering all 396 measurement points are also included therein. It is evident that the interquartile range that corresponds to the suburbs is narrower than the one obtained for the urban areas, a result that may be  
Figure 2: Box-and-whisker plots, per environment type and for all measurement points together. (**a**) Total electric field strength \(E\) (mV/m) and (**b**) total exposure ratio \(\Lambda\). attributed to the fact that the suburban environments exhibit a more uniform construction than the urban areas. Moreover, the difference between urban and suburban environments is a reasonable outcome as the p-values obtained from the aforementioned Mood's Median tests were \(<\)0.05 (with the exception of the 27-879 MHz band). Figure 3 summarizes the measured values of the electric field strength (Figure 3a) and the calculated values of the total exposure ratio \(\Lambda\) (Figure 3b) by plotting the cumulative distribution, as the percentage of measurements. The range of the E-field strength recordings is divided into eight consecutive sub-ranges, as indicated on the horizontal axis of Figure 3a, whereas the nine sub-ranges of \(\Lambda\) are depicted on the horizontal axis of Figure 3b. Each shaded bar comprises the values that fall within the denoted sub-range; the light gray bar corresponds to the percentage of the values that refer to suburban areas, whereas the remaining (i.e., the dark gray bar) incorporates the urban measurements. For example, in the first sub-range of Figure 3a (i.e., 0-0.5 V/m), 38% of the E-field measurements were recorded in urban environments, while the remaining 62% correspond to the suburbs. It may be readily verified, from Figure 3a, that the greatest number of measurements, i.e., almost 90%, correspond to an E-field strength lower than 1 V/m, while only 1% of the values exceed 2.5 V/m. Moreover, a great percentage (68%) of the measurements are found between 0.5 and 1 V/m, as denoted by the abrupt increase when the distribution transitions from the range 0-0.5 to 0.5-1 V/m. Regarding the total exposure ratio (Figure 3b), the vast majority of values (almost 94%) are lower than 0.2, a remark that ensures compliance with the established reference levels. Only a very small percentage (i.e., 0.8%) of the values of \(\Lambda\) exceed 1, and it may be attributed to extreme outliers such as the one mentioned in the beginning of this Section, in the suburb \"Kounoupidiana\". The original (measured) and certain approximating distributions of the E-field measurements are presented in Figure 4, whereas the corresponding approximating distributions for the total exposure ratio \(\Lambda\) are depicted in Figure 5. Both urban (Figures 4a and 5a) and suburban (Figures 4b and 5b) environments are considered. The distributions that correspond to the original data are depicted in the form of bar graphs. On the one hand, Figure 4 confirms the familiar remark that the majority of E-field measurements are below 1 V/m, with most of them ranging between 0.5 and 1 V/m. On the other hand, it is evident from the bar graphs of Figure 5 that most of the total exposure ratio values lie in the range  
Figure 3: Cumulative distribution (%) of (a) the E-field strength measurements and (b) the calculated values of the total exposure ratio \(\Lambda\), for specific value ranges, and classification by environment type. of \(0\leq\Lambda\leq 0.2\). This is an expected outcome if one considers the results depicted either in the last line of Table 1 or in Figure 3b. According to goodness-of-fit tests, the depicted lognormal, gamma, Weibull, and normal distributions are the most suitable to approximate the measurements in urban environments, whereas the lognormal, gamma, and normal distributions fit better to the data obtained for the suburbs.