PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-19:27:50
G01     114.1          21.5               15.8 +/-    1.93      33.5 +/-    1.93  0.120 / 0.080
G07     93.1           63.8               14.0 +/-    0.77      15.4 +/-    0.77  0.110 / 0.120
G08     43.9           29.7               12.2 +/-    1.28      21.6 +/-    1.28  0.130 / 0.190
G09     176.5          20.8               15.1 +/-    4.00      32.6 +/-    4.00  0.120 / 0.180
G11     101.1          41.9               15.7 +/-    0.76      22.2 +/-    0.76  0.050 / 0.040
G13     314.8          23.5               11.0 +/-    1.28      22.2 +/-    1.28  0.030 / 0.030
G17     204.5          26.5               15.1 +/-    1.09      28.5 +/-    1.09  0.110 / 0.150
G18     88.8           22.8               12.6 +/-    0.93      26.0 +/-    0.93  0.130 / 0.190
G28     304.2          59.5               12.5 +/-    0.86      14.2 +/-    0.86  0.030 / 0.030
G30     3.7            74.0               14.1 +/-    0.32      14.6 +/-    0.32  0.030 / 0.030