PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-08:27:50
G10     305.4          54.2                3.6 +/-    0.75       4.4 +/-    0.75  0.040 / 0.070
G14     212.5          13.5                2.5 +/-    2.95       6.5 +/-    2.95  0.060 / 0.080
G15     45.5           22.7                1.9 +/-    2.01       3.9 +/-    2.01  0.190 / 0.740
G20     60.2           41.3                3.9 +/-    0.78       5.6 +/-    0.78  0.130 / 0.770
G21     111.7          70.2                5.3 +/-    0.95       5.5 +/-    0.95  0.070 / 0.080
G24     91.5           28.3                4.2 +/-    1.64       7.6 +/-    1.64  0.060 / 0.070
G27     293.5          36.5                6.8 +/-    2.75      10.5 +/-    2.75  0.140 / 0.120
G32     213.0          39.0                5.7 +/-    1.12       8.4 +/-    1.12  0.080 / 0.140