PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/06/30-13:28:00
G07     337.8          59.7                7.6 +/-    0.54       8.6 +/-    0.54  0.030 / 0.040
G08     93.4           52.6               10.4 +/-    0.54      12.7 +/-    0.54  0.060 / 0.040
G09     184.6          68.9                9.1 +/-    0.56       9.7 +/-    0.56  0.080 / 0.120
G11     143.4          15.5                8.1 +/-    2.42      20.0 +/-    2.42  0.080 / 0.100
G23     156.0          36.1                9.2 +/-    0.82      14.4 +/-    0.82  0.030 / 0.030
G27     52.0           29.9                7.7 +/-    1.27      13.6 +/-    1.27  0.040 / 0.040
G28     240.1          32.2                7.5 +/-    2.99      12.5 +/-    2.99  0.070 / 0.080
G30     304.5          37.0                8.1 +/-    1.17      12.4 +/-    1.17  0.070 / 0.070