PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/21-00:27:50
G07     339.2          60.0                4.9 +/-    0.39       5.5 +/-    0.39  0.060 / 0.140
G08     93.5           52.9                7.9 +/-    0.51       9.6 +/-    0.51  0.070 / 0.160
G09     189.1          70.1                8.3 +/-    0.64       8.8 +/-    0.64  0.030 / 0.030
G11     144.5          15.0                7.2 +/-    2.51      18.0 +/-    2.51  0.040 / 0.030
G23     156.7          37.1                8.6 +/-    0.67      13.2 +/-    0.67  0.030 / 0.040
G27     50.7           28.7                4.4 +/-    3.05       7.9 +/-    3.05  0.050 / 0.040
G28     241.1          33.5                5.0 +/-    1.12       8.1 +/-    1.12  0.080 / 0.120
G30     307.4          40.6                5.0 +/-    1.58       7.1 +/-    1.58  0.060 / 0.180