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Table 3 Coefficients of a linear fit \( N_{\text{m}} F2\text{(RISR)} = a \cdot N_{\text{m}} F2\text{(RKN)} + b \) to scatter plot of RISR electron density versus RKN electron density for 1 beam (first 4 lines) and 20 beam (last 4 lines) RISR measurements (Fig. 7)

From: Comparison of SuperDARN peak electron density estimates based on elevation angle measurements to ionosonde and incoherent scatter radar measurements

 a\( b\text{(} \times 10^{11} \;\text{m}^{ - 3} \text{)} \)Correlation coefficientNumber of points
Night, 1 beam2.38− 1.840.23304
Dawn, 1 beam0.530.620.28175
Day, 1 beam0.96− 0.130.49563
Dusk, 1 beam1.56− 0.640.44680
Night, 20 beams− 0.442.84− 0.14111
Dawn, 20 beams0.600.440.15142
Day, 20 beams1.09− 0.410.56743
Dusk, 20 beams1.40− 0.320.47546