PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/28-20:58:00
G01     67.5           32.5               13.3 +/-    1.16      22.2 +/-    1.16  0.100 / 0.490
G07     139.1          28.9               15.8 +/-    1.43      28.4 +/-    1.43  0.090 / 0.360
G11     52.6           29.9               12.5 +/-    1.18      21.9 +/-    1.18  0.030 / 0.080
G13     271.2          37.0               15.4 +/-    1.28      23.5 +/-    1.28  0.030 / 0.050
G15     300.1          15.8                9.6 +/-    2.80      23.3 +/-    2.80  0.050 / 0.080
G17     236.7          67.1               15.2 +/-    0.79      16.4 +/-    0.79  0.040 / 0.090
G18     47.2           17.1                9.8 +/-    0.86      23.3 +/-    0.86  0.060 / 0.140
G19     226.5          43.6               16.1 +/-    1.29      22.2 +/-    1.29  0.050 / 0.110
G28     25.2           58.4               12.7 +/-    0.73      14.6 +/-    0.73  0.050 / 0.180
G30     138.2          57.5               14.7 +/-    0.66      17.1 +/-    0.66  0.080 / 0.150