PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/17-22:57:30
G07     359.7          65.5               10.4 +/-    0.69      11.3 +/-    0.69  0.050 / 0.140
G08     75.4           52.5               10.3 +/-    1.16      12.7 +/-    1.16  0.060 / 0.140
G09     182.7          57.8               12.3 +/-    0.95      14.3 +/-    0.95  0.030 / 0.040
G11     137.8          22.2               11.6 +/-    0.73      24.2 +/-    0.73  0.030 / 0.030
G23     158.8          24.6               11.4 +/-    2.42      22.4 +/-    2.42  0.080 / 0.240
G27     43.2           21.3                8.4 +/-    1.89      18.0 +/-    1.89  0.070 / 0.160
G28     252.1          41.7               11.4 +/-    2.22      16.1 +/-    2.22  0.040 / 0.040
G30     318.3          49.4                9.2 +/-    0.58      11.7 +/-    0.58  0.040 / 0.060