PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/28-02:28:00
G01     91.0           31.6                5.5 +/-    1.10       9.3 +/-    1.10  0.030 / 0.040
G07     124.8          46.2                7.5 +/-    0.49       9.9 +/-    0.49  0.040 / 0.050
G11     71.8           41.1                5.3 +/-    1.01       7.6 +/-    1.01  0.080 / 0.070
G13     296.4          35.1                4.7 +/-    5.27       7.4 +/-    5.27  0.080 / 0.100
G17     214.3          52.2                7.5 +/-    0.93       9.2 +/-    0.93  0.050 / 0.040
G19     214.3          27.1                6.5 +/-    1.29      12.1 +/-    1.29  0.040 / 0.040
G28     349.2          61.7                3.7 +/-    0.41       4.1 +/-    0.41  0.040 / 0.040
G30     107.4          72.9                5.6 +/-    0.85       5.8 +/-    0.85  0.030 / 0.040