PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/13-18:28:00
G07     324.6          54.6               11.1 +/-    0.51      13.3 +/-    0.51  0.040 / 0.010
G08     114.8          50.2               12.7 +/-    0.67      16.0 +/-    0.67  0.050 / 0.020
G09     208.3          79.4               10.3 +/-    0.36      10.5 +/-    0.36  0.050 / 0.070
G16     45.4           10.5                8.9 +/-    2.22      24.7 +/-    2.22  0.050 / 0.080
G23     152.1          43.2               12.6 +/-    0.92      17.4 +/-    0.92  0.200 / 0.340
G27     60.0           33.8                9.9 +/-    1.24      16.1 +/-    1.24  0.150 / 0.510
G28     233.5          25.6               13.6 +/-    2.61      26.2 +/-    2.61  0.090 / 0.050
G30     298.8          33.2                8.7 +/-    1.33      14.3 +/-    1.33  0.110 / 0.050