PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-18:43:00
G01     123.9          13.5               14.0 +/-    2.40      36.2 +/-    2.40  0.030 / 0.030
G07     75.8           64.7               11.4 +/-    0.60      12.5 +/-    0.60  0.030 / 0.040
G08     47.9           36.2                9.7 +/-    1.21      15.1 +/-    1.21  0.120 / 0.410
G09     178.5          33.9               12.7 +/-    0.82      20.6 +/-    0.82  0.110 / 0.350
G11     113.1          37.7               12.6 +/-    1.17      19.0 +/-    1.17  0.060 / 0.110
G13     319.9          15.1               10.3 +/-    3.23      25.7 +/-    3.23  0.060 / 0.080
G17     199.7          18.6               13.4 +/-    1.77      30.5 +/-    1.77  0.160 / 0.140
G18     98.3           18.1               11.5 +/-    1.96      26.5 +/-    1.96  0.090 / 0.110
G28     276.1          51.3               13.6 +/-    2.75      16.9 +/-    2.75  0.050 / 0.030
G30     339.3          64.6               11.2 +/-    0.97      12.2 +/-    0.97  0.030 / 0.040