PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/21-05:28:10
G02     290.9          82.4                2.8 +/-    0.64       2.9 +/-    0.64  0.070 / 0.110
G05     167.7          24.2                3.9 +/-    2.37       7.8 +/-    2.37  0.080 / 0.080
G06     39.4           52.7                4.0 +/-    0.67       4.8 +/-    0.67  0.030 / 0.030
G12     320.1          58.8                3.4 +/-    0.61       3.9 +/-    0.61  0.030 / 0.030
G17     77.1           19.0                2.2 +/-    2.18       5.0 +/-    2.18  0.060 / 0.040
G19     65.5           33.4                3.3 +/-    1.10       5.3 +/-    1.10  0.070 / 0.050
G24     238.1          30.0                6.4 +/-    2.48      11.3 +/-    2.48  0.120 / 0.130
G25     317.7          18.6                3.5 +/-    1.34       7.9 +/-    1.34  0.090 / 0.110