PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/21-07:28:10
G01     78.1           33.2                4.2 +/-    1.51       6.9 +/-    1.51  0.030 / 0.040
G07     133.5          35.7                7.5 +/-    0.93      11.8 +/-    0.93  0.040 / 0.040
G11     58.7           34.2                4.9 +/-    0.69       7.9 +/-    0.69  0.070 / 0.060
G13     284.1          37.0                5.0 +/-    0.62       7.7 +/-    0.62  0.060 / 0.060
G15     307.7          14.0                1.3 +/-    2.88       3.4 +/-    2.88  0.040 / 0.030
G17     224.5          65.0                6.3 +/-    0.87       6.9 +/-    0.87  0.040 / 0.030
G19     220.0          37.8                5.8 +/-    2.20       8.7 +/-    2.20  0.090 / 0.180
G28     9.7            60.3                3.7 +/-    1.34       4.1 +/-    1.34  0.080 / 0.220
G30     126.9          67.0                6.6 +/-    0.95       7.1 +/-    0.95  0.050 / 0.090