PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/23-00:28:00
G05     47.6           21.7                6.8 +/-    0.32      14.3 +/-    0.32  0.230 / 0.410
G13     80.7           37.4               11.7 +/-    1.39      17.8 +/-    1.39  0.260 / 0.450
G15     132.3          49.7               11.0 +/-    2.68      13.9 +/-    2.68  0.080 / 0.170
G16     317.4          10.6                0.1 +/-   17.60       0.2 +/-   17.60  0.080 / 0.130
G18     242.6          38.6              -20.5 +/-   66.57     -30.4 +/-   66.57  0.040 / 0.080
G20     27.8           67.5               12.2 +/-    2.40      13.1 +/-    2.40  0.060 / 0.080
G21     310.0          45.2                9.4 +/-    1.26      12.6 +/-    1.26  0.130 / 0.570
G25     197.1          10.3               12.6 +/-    2.64      34.8 +/-    2.64  0.110 / 0.470
G26     291.6          20.1                2.2 +/-   21.95       4.8 +/-   21.95  0.050 / 0.040
G29     153.1          73.3               27.9 +/-   18.69      29.0 +/-   18.69  0.020 / 0.050