PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-16:27:40
G07     335.3          59.3                7.5 +/-    0.34       8.6 +/-    0.34  0.350 / 0.590
G08     107.2          49.8                8.4 +/-    0.67      10.6 +/-    0.67  0.150 / 0.390
G09     211.4          79.9                7.4 +/-    0.59       7.5 +/-    0.59  0.030 / 0.050
G11     148.1          10.8                3.4 +/-   19.92       9.3 +/-   19.92  0.050 / 0.040
G16     44.9           14.1                6.1 +/-    3.19      15.5 +/-    3.19  0.110 / 0.130
G23     153.4          47.2                9.9 +/-    0.64      13.0 +/-    0.64  0.090 / 0.100
G27     62.3           35.2                7.2 +/-    1.30      11.4 +/-    1.30  0.080 / 0.080
G28     232.1          20.8                8.8 +/-    3.67      19.0 +/-    3.67  0.060 / 0.060
G30     298.6          33.3                6.4 +/-    1.48      10.5 +/-    1.48  0.140 / 0.350