PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/18-23:42:40
G10     253.1          30.2               12.0 +/-    2.22      21.0 +/-    2.22  0.050 / 0.040
G13     50.6           27.2                6.4 +/-    3.03      11.9 +/-    3.03  0.060 / 0.040
G15     79.9           56.5               10.7 +/-    0.98      12.5 +/-    0.98  0.140 / 0.180
G16     293.6          15.3                7.1 +/-    1.58      17.5 +/-    1.58  0.070 / 0.140
G20     273.7          52.2               10.8 +/-    2.75      13.3 +/-    2.75  0.030 / 0.040
G21     337.1          61.6                9.0 +/-    0.87      10.0 +/-    0.87  0.040 / 0.040
G26     266.0          14.4                8.9 +/-    2.04      22.6 +/-    2.04  0.110 / 0.420
G29     163.9          46.2               11.0 +/-    0.67      14.5 +/-    0.67  0.110 / 0.380