PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-19:57:50
G01     90.5           31.3               11.5 +/-    1.52      19.6 +/-    1.52  0.040 / 0.060
G07     125.8          39.9               12.2 +/-    0.88      17.8 +/-    0.88  0.050 / 0.070
G11     67.8           39.7               10.5 +/-    1.64      15.3 +/-    1.64  0.070 / 0.120
G13     294.8          36.6               10.6 +/-    4.57      16.4 +/-    4.57  0.050 / 0.130
G17     212.9          53.6               15.1 +/-    0.93      18.3 +/-    0.93  0.100 / 0.180
G18     62.2           23.0                9.7 +/-    1.50      19.9 +/-    1.50  0.080 / 0.140
G19     213.6          26.7               13.6 +/-    1.27      25.5 +/-    1.27  0.090 / 0.050
G28     338.1          61.6               11.7 +/-    0.59      13.1 +/-    0.59  0.070 / 0.040
G30     105.1          75.1               12.9 +/-    0.88      13.3 +/-    0.88  0.030 / 0.030