PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/18-18:58:00
G01     118.4          17.8               12.6 +/-    1.59      29.4 +/-    1.59  0.030 / 0.030
G07     90.2           61.2               11.9 +/-    0.99      13.3 +/-    0.99  0.030 / 0.040
G08     44.6           30.5               10.0 +/-    1.33      17.3 +/-    1.33  0.230 / 0.390
G09     177.6          27.0               11.9 +/-    1.45      22.2 +/-    1.45  0.180 / 0.410
G11     104.7          40.6               11.3 +/-    0.43      16.3 +/-    0.43  0.150 / 0.140
G13     317.2          20.4                9.1 +/-    1.25      19.8 +/-    1.25  0.090 / 0.140
G17     200.9          25.4               12.9 +/-    1.70      24.9 +/-    1.70  0.060 / 0.090
G18     91.5           20.7               11.3 +/-    2.26      24.4 +/-    2.26  0.110 / 0.090
G28     286.6          54.6               11.7 +/-    2.36      14.0 +/-    2.36  0.040 / 0.040
G30     350.4          70.1               11.5 +/-    0.45      12.1 +/-    0.45  0.030 / 0.030