PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/31-13:27:40
G01     64.9           31.7                6.9 +/-    0.48      11.7 +/-    0.48  0.030 / 0.050
G06     181.6          10.7              -10.3 +/-   37.67     -28.2 +/-   37.67  0.030 / 0.040
G07     139.9          23.9                7.4 +/-    1.58      14.8 +/-    1.58  0.050 / 0.140
G11     49.9           24.9                6.3 +/-    1.01      12.2 +/-    1.01  0.090 / 0.150
G13     270.9          36.0                7.8 +/-    1.11      12.1 +/-    1.11  0.120 / 0.410
G15     300.1          15.4                2.7 +/-    2.05       6.7 +/-    2.05  0.110 / 0.320
G17     248.4          75.8                7.3 +/-    0.52       7.5 +/-    0.52  0.050 / 0.140
G19     228.6          48.6                8.1 +/-    1.49      10.4 +/-    1.49  0.060 / 0.140
G28     28.6           57.8                5.2 +/-    0.39       6.0 +/-    0.39  0.030 / 0.040
G30     139.6          58.8                6.8 +/-    0.68       7.8 +/-    0.68  0.030 / 0.030