PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-04:28:00
G01     47.6           23.5                3.6 +/-    1.52       7.4 +/-    1.52  0.040 / 0.050
G06     179.7          25.6                5.9 +/-    1.37      11.4 +/-    1.37  0.050 / 0.050
G11     44.4           13.7                2.2 +/-    1.84       5.8 +/-    1.84  0.130 / 0.410
G13     248.3          28.5                4.4 +/-    2.72       8.0 +/-    2.72  0.100 / 0.420
G15     279.7          15.4                3.7 +/-    2.52       9.1 +/-    2.52  0.030 / 0.020
G17     328.8          77.3                5.6 +/-    0.41       5.7 +/-    0.41  0.020 / 0.020
G19     253.7          63.4                5.0 +/-    0.45       5.5 +/-    0.45  0.130 / 0.170
G28     58.3           51.1                3.7 +/-    0.67       4.6 +/-    0.67  0.130 / 0.180
G30     150.2          34.9                6.9 +/-    1.49      10.9 +/-    1.49  0.100 / 0.090