PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-21:12:50
G01     77.3           33.3               12.0 +/-    1.77      19.6 +/-    1.77  0.250 / 0.300
G07     134.0          36.4               12.9 +/-    0.90      19.9 +/-    0.90  0.440 / 0.180
G11     59.1           35.5               11.4 +/-    0.70      17.9 +/-    0.70  0.110 / 0.220
G13     281.8          37.6               11.2 +/-    1.21      17.0 +/-    1.21  0.100 / 0.250
G15     307.1          14.0                9.0 +/-    2.72      23.0 +/-    2.72  0.070 / 0.100
G17     224.9          59.2               12.6 +/-    2.20      14.4 +/-    2.20  0.170 / 0.090
G18     54.0           21.0               10.4 +/-    4.54      22.4 +/-    4.54  0.040 / 0.060
G19     220.5          36.2               14.0 +/-    1.70      21.7 +/-    1.70  0.160 / 0.090
G28     10.5           60.3               12.2 +/-    1.74      13.8 +/-    1.74  0.050 / 0.040
G30     128.9          65.1               12.3 +/-    0.58      13.4 +/-    0.58  0.040 / 0.040