PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/30-18:42:50
G01     103.7          26.6               15.3 +/-    0.96      28.9 +/-    0.96  0.030 / 0.050
G07     114.1          49.5               15.6 +/-    0.63      19.8 +/-    0.63  0.030 / 0.050
G08     41.6           17.6               10.1 +/-    0.89      23.5 +/-    0.89  0.070 / 0.060
G09     175.0          12.5               16.9 +/-    1.73      44.6 +/-    1.73  0.040 / 0.060
G11     83.3           42.9               15.9 +/-    0.50      22.1 +/-    0.50  0.040 / 0.080
G13     306.9          31.2               13.8 +/-    1.98      23.5 +/-    1.98  0.040 / 0.070
G17     206.2          40.9               17.7 +/-    1.64      25.4 +/-    1.64  0.070 / 0.130
G18     75.1           24.0               12.0 +/-    0.69      24.0 +/-    0.69  0.080 / 0.170
G28     314.0          59.8               14.5 +/-    0.82      16.5 +/-    0.82  0.070 / 0.160
G30     49.0           79.1               14.2 +/-    0.75      14.4 +/-    0.75  0.090 / 0.160