PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-17:42:40
G01     118.4          18.5               11.3 +/-    1.46      25.7 +/-    1.46  0.090 / 0.070
G07     81.9           66.5               11.4 +/-    0.60      12.3 +/-    0.60  0.040 / 0.070
G08     45.3           32.8                9.3 +/-    1.22      15.4 +/-    1.22  0.030 / 0.030
G09     176.9          25.2               10.0 +/-    1.95      19.4 +/-    1.95  0.040 / 0.030
G11     106.8          40.3               11.2 +/-    0.58      16.2 +/-    0.58  0.030 / 0.030
G13     317.4          19.9               10.8 +/-    1.78      23.9 +/-    1.78  0.030 / 0.040
G17     202.8          22.8               11.1 +/-    2.26      22.9 +/-    2.26  0.060 / 0.050
G18     93.8           21.2               10.4 +/-    1.89      22.3 +/-    1.89  0.040 / 0.060
G28     294.6          57.8               10.1 +/-    1.20      11.7 +/-    1.20  0.100 / 0.200
G30     349.9          69.8               11.2 +/-    0.37      11.9 +/-    0.37  0.140 / 0.230