PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/28-19:27:50
G01     84.3           32.4               10.6 +/-    1.16      17.6 +/-    1.16  0.030 / 0.080
G07     129.8          35.1               12.1 +/-    0.99      19.1 +/-    0.99  0.040 / 0.080
G11     62.4           37.4                9.9 +/-    1.04      15.0 +/-    1.04  0.050 / 0.130
G13     288.6          38.0               10.5 +/-    0.74      15.8 +/-    0.74  0.060 / 0.090
G15     311.5          12.3                9.0 +/-    2.91      23.8 +/-    2.91  0.040 / 0.050
G17     217.1          58.4               13.2 +/-    0.72      15.2 +/-    0.72  0.040 / 0.050
G18     57.4           21.8                7.6 +/-    1.60      15.9 +/-    1.60  0.070 / 0.110
G19     216.1          31.5               12.5 +/-    2.82      21.1 +/-    2.82  0.070 / 0.110
G28     347.8          61.6                9.0 +/-    0.56      10.1 +/-    0.56  0.050 / 0.140
G30     118.8          70.7               12.1 +/-    0.63      12.7 +/-    0.63  0.050 / 0.140