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                9.5 +/-    1.01      15.8 +/-    1.01  0.040 / 0.040
G07     129.8          35.1               11.9 +/-    0.49      18.8 +/-    0.49  0.040 / 0.060
G11     62.4           37.4               10.6 +/-    0.94      16.2 +/-    0.94  0.050 / 0.090
G13     288.6          38.0               13.3 +/-    0.94      19.9 +/-    0.94  0.050 / 0.090
G15     311.5          12.3                9.5 +/-    2.12      25.3 +/-    2.12  0.030 / 0.030
G17     217.1          58.4               12.7 +/-    1.39      14.6 +/-    1.39  0.030 / 0.030
G18     57.4           21.8                8.6 +/-    2.89      18.2 +/-    2.89  0.060 / 0.100
G19     216.1          31.5               11.6 +/-    2.08      19.7 +/-    2.08  0.050 / 0.100
G28     347.8          61.6                9.4 +/-    0.37      10.6 +/-    0.37  0.130 / 0.200
G30     118.8          70.7               12.1 +/-    0.88      12.8 +/-    0.88  0.150 / 0.190