PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-07:27:50
G01     271.2          41.1                7.0 +/-    2.13      10.1 +/-    2.13  0.060 / 0.060
G03     315.4          26.7                6.1 +/-    1.81      11.4 +/-    1.81  0.070 / 0.090
G10     129.3          18.6                6.3 +/-    1.67      14.4 +/-    1.67  0.070 / 0.040
G11     248.0          21.5                7.9 +/-    1.79      16.7 +/-    1.79  0.040 / 0.050
G14     44.5           49.1                4.4 +/-    0.96       5.6 +/-    0.96  0.050 / 0.060
G22     314.4          52.5                5.8 +/-    1.02       7.1 +/-    1.02  0.050 / 0.070
G25     49.3           14.7                3.0 +/-    2.31       7.4 +/-    2.31  0.090 / 0.130
G26     149.2          23.9                8.5 +/-    2.46      17.0 +/-    2.46  0.090 / 0.120
G31     56.3           74.4                4.4 +/-    0.36       4.5 +/-    0.36  0.080 / 0.170
G32     63.2           33.4                5.9 +/-    2.24       9.7 +/-    2.24  0.060 / 0.160