PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/21-05:12:40
G02     199.3          21.0                8.5 +/-    1.94      18.3 +/-    1.94  0.040 / 0.090
G06     175.5          49.2                8.2 +/-    1.29      10.4 +/-    1.29  0.040 / 0.090
G13     229.3          14.2                6.1 +/-    3.27      15.4 +/-    3.27  0.030 / 0.050
G17     19.5           61.3                5.0 +/-    0.95       5.7 +/-    0.95  0.030 / 0.040
G19     320.5          71.4                5.4 +/-    0.72       5.6 +/-    0.72  0.070 / 0.130
G24     311.7          27.6                3.5 +/-    2.63       6.5 +/-    2.63  0.060 / 0.160
G28     86.9           40.0                6.3 +/-    1.33       9.2 +/-    1.33  0.050 / 0.050
G30     155.9          13.3                8.7 +/-    2.07      22.5 +/-    2.07  0.040 / 0.050