Fig. 4.
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Integrated radio spectrum of RN, RS, R1, R2, and R2 from 45 MHz to 3 GHz. Extraction regions are shown in the bottom left corner. Values obtained in this work at 45 MHz are highlighted in red, while extra points are at 145, 323, 608, 1230, 1380 MHz (Hoang et al. 2017), and 1.5, 3 GHz (Di Gennaro et al. 2018). Above 3 GHz values from high frequencies from Stroe et al. 2016 (grey squares) and Loi et al. (2017) (yellow diamonds) studies are reported.
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