PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/22-12:58:10
G02     203.9          28.4                4.3 +/-    1.92       7.9 +/-    1.92  0.070 / 0.070
G06     160.3          67.3                3.6 +/-    0.86       3.8 +/-    0.86  0.090 / 0.100
G12     307.0          16.1                0.6 +/-    2.83       1.4 +/-    2.83  0.120 / 0.370
G17     35.3           49.6                2.2 +/-    0.68       2.8 +/-    0.68  0.130 / 0.340
G19     342.9          67.8                1.7 +/-    0.96       1.8 +/-    0.96  0.030 / 0.040
G24     298.1          38.8                2.2 +/-    1.19       3.3 +/-    1.19  0.030 / 0.040
G28     99.6           33.6                2.8 +/-    0.75       4.6 +/-    0.75  0.040 / 0.040