PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/18-20:27:30
G02     19.6           65.3                8.3 +/-    0.45       9.0 +/-    0.45  0.050 / 0.040
G05     152.7          52.2               13.3 +/-    0.95      16.3 +/-    0.95  0.040 / 0.050
G06     48.9           22.6                7.5 +/-    0.93      15.6 +/-    0.93  0.040 / 0.030
G12     210.8          77.0               10.4 +/-    0.66      10.7 +/-    0.66  0.030 / 0.030
G19     90.1           18.6               10.3 +/-    0.46      23.5 +/-    0.46  0.060 / 0.080
G25     308.9          45.8                8.9 +/-    2.03      11.9 +/-    2.03  0.070 / 0.080
G29     299.1          19.3                9.6 +/-    1.12      21.5 +/-    1.12  0.040 / 0.060