PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/19-14:13:00
G01     231.7          22.0                9.4 +/-    2.13      19.6 +/-    2.13  0.060 / 0.090
G03     298.2          65.5                8.5 +/-    0.87       9.3 +/-    0.87  0.060 / 0.080
G14     78.5           31.5                7.7 +/-    2.13      13.1 +/-    2.13  0.060 / 0.110
G16     150.7          38.9                9.6 +/-    0.88      14.2 +/-    0.88  0.070 / 0.130
G18     208.3          12.2                8.9 +/-    1.99      23.6 +/-    1.99  0.030 / 0.040
G22     218.0          74.4               10.5 +/-    1.03      10.8 +/-    1.03  0.030 / 0.040
G23     304.6          36.3                7.9 +/-    1.45      12.3 +/-    1.45  0.090 / 0.110
G26     106.9          51.9               10.8 +/-    0.53      13.3 +/-    0.53  0.090 / 0.160
G31     43.4           36.5                8.0 +/-    1.37      12.3 +/-    1.37  0.040 / 0.040