PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-12:58:00
G01     235.3          26.1                7.2 +/-    2.30      13.7 +/-    2.30  0.040 / 0.050
G03     305.3          63.9                2.0 +/-    0.94       2.2 +/-    0.94  0.040 / 0.040
G14     75.3           31.2                6.7 +/-    1.61      11.5 +/-    1.61  0.090 / 0.150
G16     158.4          30.2                7.2 +/-    1.25      12.5 +/-    1.25  0.080 / 0.140
G18     208.9          14.9                4.5 +/-    2.09      11.2 +/-    2.09  0.030 / 0.040
G22     242.1          77.1                5.4 +/-    0.85       5.6 +/-    0.85  0.030 / 0.040
G23     298.1          29.1                3.8 +/-    1.58       6.8 +/-    1.58  0.070 / 0.170
G26     123.0          48.8                7.4 +/-    0.92       9.5 +/-    0.92  0.070 / 0.130
G31     41.6           44.2                4.3 +/-    1.47       5.9 +/-    1.47  0.060 / 0.120
G32     87.5           17.8                6.3 +/-    1.16      14.7 +/-    1.16  0.070 / 0.140