PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-12:12:40
G01     228.0          18.5                5.6 +/-    2.72      12.9 +/-    2.72  0.100 / 0.110
G03     289.8          67.6                5.6 +/-    0.47       6.0 +/-    0.47  0.090 / 0.130
G14     82.6           29.5                5.0 +/-    1.47       8.8 +/-    1.47  0.040 / 0.030
G16     146.2          44.0                5.8 +/-    0.54       7.9 +/-    0.54  0.040 / 0.020
G22     208.9          70.8                6.8 +/-    0.47       7.1 +/-    0.47  0.300 / 0.410
G23     308.3          39.5                3.4 +/-    1.71       5.0 +/-    1.71  0.090 / 0.140
G26     97.6           53.3                5.0 +/-    0.30       6.1 +/-    0.30  0.030 / 0.030
G31     45.1           31.8                4.1 +/-    1.26       7.0 +/-    1.26  0.030 / 0.030