PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-20:27:50
G01     79.6           33.3               11.1 +/-    0.34      18.3 +/-    0.34  0.070 / 0.170
G07     132.7          38.2               12.5 +/-    0.97      18.7 +/-    0.97  0.080 / 0.200
G11     60.6           36.4                9.8 +/-    0.43      15.1 +/-    0.43  0.070 / 0.110
G13     284.2          37.6               12.9 +/-    0.79      19.5 +/-    0.79  0.070 / 0.120
G15     308.8          13.3               10.1 +/-    0.90      26.1 +/-    0.90  0.030 / 0.080
G17     222.8          58.0               14.2 +/-    0.92      16.5 +/-    0.92  0.050 / 0.080
G18     55.7           21.7                7.6 +/-    0.89      16.0 +/-    0.89  0.040 / 0.050
G19     219.3          34.2               15.3 +/-    1.29      24.7 +/-    1.29  0.040 / 0.060
G28     6.9            60.7                9.3 +/-    0.74      10.5 +/-    0.74  0.040 / 0.120
G30     126.0          67.3               12.3 +/-    1.22      13.3 +/-    1.22  0.050 / 0.100