PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-19:58:00
G01     51.5           26.4               11.4 +/-    1.60      21.5 +/-    1.60  0.140 / 0.310
G06     177.4          24.3               15.1 +/-    1.15      30.1 +/-    1.15  0.190 / 0.310
G07     145.8          14.3               15.1 +/-    4.20      38.2 +/-    4.20  0.200 / 0.390
G11     45.3           17.1                9.0 +/-    0.84      21.1 +/-    0.84  0.160 / 0.320
G13     252.4          31.2               15.7 +/-    1.05      26.8 +/-    1.05  0.040 / 0.060
G15     285.8          15.7               12.1 +/-    2.05      29.5 +/-    2.05  0.050 / 0.060
G17     291.1          77.6               12.6 +/-    0.64      12.9 +/-    0.64  0.090 / 0.290
G19     243.4          57.0               15.2 +/-    0.94      17.8 +/-    0.94  0.110 / 0.280
G28     50.4           53.4               11.6 +/-    0.33      14.1 +/-    0.33  0.040 / 0.060
G30     148.8          42.4               14.8 +/-    1.10      20.7 +/-    1.10  0.040 / 0.060