PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/23-09:58:10
G02     57.9           33.2                2.5 +/-    1.34       4.2 +/-    1.34  0.030 / 0.020
G05     63.6           63.5                4.2 +/-    0.58       4.6 +/-    0.58  0.020 / 0.020
G12     187.2          38.0                7.5 +/-    0.70      11.2 +/-    0.70  0.160 / 0.240
G13     132.0          12.5                5.7 +/-    2.11      15.0 +/-    2.11  0.190 / 0.220
G20     208.1          51.4                6.3 +/-    0.49       7.9 +/-    0.49  0.050 / 0.040
G21     269.3          17.8                4.4 +/-    1.02      10.2 +/-    1.02  0.040 / 0.060
G25     243.8          54.3                4.3 +/-    2.01       5.1 +/-    2.01  0.030 / 0.050
G29     327.7          53.2                3.4 +/-    1.06       4.2 +/-    1.06  0.040 / 0.060