PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-08:27:50
G01     220.2          10.9                7.5 +/-    1.53      20.6 +/-    1.53  0.030 / 0.040
G03     262.3          69.7                8.5 +/-    0.56       9.0 +/-    0.56  0.030 / 0.040
G09     300.1          15.1                4.4 +/-    3.27      10.9 +/-    3.27  0.170 / 0.430
G14     93.5           20.6                4.9 +/-    1.45      10.6 +/-    1.45  0.230 / 0.410
G16     132.8          54.3                9.2 +/-    0.46      11.0 +/-    0.46  0.100 / 0.250
G22     200.4          62.0                9.3 +/-    0.49      10.4 +/-    0.49  0.100 / 0.240
G23     314.7          44.7                7.7 +/-    0.91      10.4 +/-    0.91  0.040 / 0.060
G26     77.3           52.6                8.2 +/-    0.57      10.0 +/-    0.57  0.050 / 0.060
G31     49.6           22.7                2.9 +/-    2.39       5.9 +/-    2.39  0.030 / 0.040