PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-06:57:50
G10     261.4          34.5                4.9 +/-    1.36       7.9 +/-    1.36  0.030 / 0.040
G13     44.9           22.7                2.9 +/-    2.79       6.0 +/-    2.79  0.030 / 0.030
G15     65.1           51.9                4.2 +/-    1.02       5.2 +/-    1.02  0.120 / 0.410
G16     283.8          13.6                3.4 +/-    1.17       8.9 +/-    1.17  0.120 / 0.330
G20     12.3           66.0                4.0 +/-    0.47       4.3 +/-    0.47  0.120 / 0.230
G21     351.5          68.4                4.0 +/-    0.63       4.2 +/-    0.63  0.150 / 0.210
G24     124.8          11.0                5.1 +/-    3.51      14.0 +/-    3.51  0.040 / 0.030
G27     320.5          15.1                1.5 +/-    2.23       3.8 +/-    2.23  0.040 / 0.030
G29     167.4          37.0                4.1 +/-    1.06       6.2 +/-    1.06  0.200 / 0.280