PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-19:42:40
G01     112.9          22.2               15.2 +/-    1.41      31.7 +/-    1.41  0.060 / 0.110
G07     95.7           63.0               12.7 +/-    0.37      14.1 +/-    0.37  0.060 / 0.100
G08     43.6           28.8                9.3 +/-    0.64      16.7 +/-    0.64  0.140 / 0.180
G09     176.3          19.7               16.0 +/-    0.85      35.6 +/-    0.85  0.130 / 0.250
G11     99.5           42.3               14.5 +/-    0.80      20.3 +/-    0.80  0.080 / 0.060
G13     314.1          24.3               11.0 +/-    1.70      21.7 +/-    1.70  0.070 / 0.060
G17     204.9          27.6               14.6 +/-    1.54      26.9 +/-    1.54  0.040 / 0.040
G18     87.5           23.1               11.4 +/-    1.21      23.3 +/-    1.21  0.030 / 0.050
G28     306.6          59.8               12.9 +/-    0.64      14.7 +/-    0.64  0.050 / 0.100
G30     7.8            74.9               13.5 +/-    0.79      14.0 +/-    0.79  0.060 / 0.090