PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/08/20-19:57:30
G02     61.6           32.1                9.8 +/-    1.00      16.5 +/-    1.00  0.030 / 0.050
G05     53.4           58.0               10.5 +/-    0.62      12.1 +/-    0.62  0.040 / 0.040
G12     180.7          24.7               12.3 +/-    1.78      24.2 +/-    1.78  0.100 / 0.260
G13     124.4          18.0               14.1 +/-    2.94      32.4 +/-    2.94  0.090 / 0.260
G15     164.3          13.9               14.7 +/-    1.59      37.6 +/-    1.59  0.070 / 0.150
G21     274.3          18.9               11.3 +/-    1.36      25.6 +/-    1.36  0.080 / 0.200
G25     229.4          48.6               13.1 +/-    0.72      16.9 +/-    0.72  0.080 / 0.450
G29     329.9          57.3                9.7 +/-    0.83      11.3 +/-    0.83  0.140 / 0.510