PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-17:12:40
G01     42.6           18.0                7.1 +/-    1.09      16.5 +/-    1.09  0.100 / 0.240
G06     175.2          36.7               15.6 +/-    2.47      24.1 +/-    2.47  0.100 / 0.300
G13     241.9          23.9               11.0 +/-    2.20      22.1 +/-    2.20  0.230 / 0.510
G15     277.3          13.0               10.9 +/-    2.00      28.4 +/-    2.00  0.230 / 0.430
G17     3.0            71.0               12.0 +/-    0.93      12.7 +/-    0.93  0.040 / 0.040
G19     274.1          69.6               12.4 +/-    0.58      13.1 +/-    0.58  0.040 / 0.040
G24     318.0          15.5                7.9 +/-    3.87      19.3 +/-    3.87  0.080 / 0.170
G28     68.1           48.1               10.4 +/-    0.82      13.4 +/-    0.82  0.080 / 0.170
G30     154.2          32.7               13.1 +/-    1.43      21.7 +/-    1.43  0.060 / 0.100