PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/02-07:28:00
G10     298.0          51.9                5.4 +/-    0.79       6.6 +/-    0.79  0.070 / 0.090
G15     46.0           27.3                2.9 +/-    1.51       5.4 +/-    1.51  0.060 / 0.120
G20     49.0           50.3                4.5 +/-    0.39       5.6 +/-    0.39  0.040 / 0.060
G21     98.1           73.9                4.5 +/-    0.46       4.6 +/-    0.46  0.030 / 0.070
G24     96.8           26.7                7.7 +/-    0.62      14.5 +/-    0.62  0.040 / 0.050
G27     299.2          34.8                6.1 +/-    1.17       9.7 +/-    1.17  0.040 / 0.050
G32     210.6          34.3                7.9 +/-    1.42      12.7 +/-    1.42  0.070 / 0.130