PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/21-19:58:10
G01     113.1          22.1               17.5 +/-    1.21      36.6 +/-    1.21  0.060 / 0.110
G07     95.3           63.1               15.3 +/-    0.58      16.9 +/-    0.58  0.060 / 0.090
G08     43.6           29.1               11.8 +/-    0.76      21.0 +/-    0.76  0.140 / 0.170
G09     176.4          19.9               19.2 +/-    1.77      42.5 +/-    1.77  0.140 / 0.200
G11     99.9           42.2               16.8 +/-    0.75      23.6 +/-    0.75  0.050 / 0.080
G13     314.2          24.2               13.1 +/-    2.00      26.2 +/-    2.00  0.040 / 0.080
G17     204.9          27.2               17.5 +/-    1.35      32.6 +/-    1.35  0.060 / 0.050
G18     87.7           23.1               13.7 +/-    0.91      28.0 +/-    0.91  0.080 / 0.070
G28     306.3          59.8               14.6 +/-    0.71      16.6 +/-    0.71  0.040 / 0.040
G30     7.9            74.9               15.9 +/-    0.64      16.4 +/-    0.64  0.040 / 0.030