PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-19:27:40
G10     252.6          30.0               10.9 +/-    0.93      19.0 +/-    0.93  0.040 / 0.060
G13     50.9           27.3                8.8 +/-    2.44      16.4 +/-    2.44  0.040 / 0.060
G15     82.0           57.2               10.7 +/-    0.33      12.4 +/-    0.33  0.080 / 0.170
G16     293.0          15.7                4.9 +/-   12.80      12.0 +/-   12.80  0.070 / 0.170
G20     274.4          53.2               13.5 +/-    1.00      16.4 +/-    1.00  0.350 / 0.890
G21     336.3          61.0               11.0 +/-    0.67      12.4 +/-    0.67  0.290 / 0.830
G26     265.9          14.6               10.0 +/-    1.30      25.2 +/-    1.30  0.030 / 0.050
G29     164.4          48.2               12.2 +/-    1.45      15.8 +/-    1.45  0.030 / 0.050