PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/23-07:57:40
G10     293.5          50.3                3.2 +/-    2.89       4.1 +/-    2.89  0.030 / 0.070
G15     46.4           29.8                2.8 +/-    1.17       5.0 +/-    1.17  0.040 / 0.060
G20     50.6           48.1                3.9 +/-    0.94       5.0 +/-    0.94  0.070 / 0.080
G21     87.8           75.4                4.7 +/-    0.41       4.9 +/-    0.41  0.060 / 0.080
G24     100.3          25.5                6.3 +/-    1.74      12.2 +/-    1.74  0.060 / 0.040
G27     302.5          33.5                2.3 +/-    3.22       3.7 +/-    3.22  0.040 / 0.040
G32     209.4          31.1                4.4 +/-    1.19       7.6 +/-    1.19  0.090 / 0.110