PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-21:27:50
G01     69.0           32.7               10.6 +/-    1.03      17.5 +/-    1.03  0.120 / 0.210
G07     138.4          30.0               13.4 +/-    0.91      23.5 +/-    0.91  0.110 / 0.180
G11     53.6           30.9               10.2 +/-    1.10      17.5 +/-    1.10  0.080 / 0.240
G13     272.8          37.2               12.0 +/-    3.21      18.3 +/-    3.21  0.090 / 0.270
G15     301.1          15.6                6.9 +/-    1.72      16.9 +/-    1.72  0.040 / 0.080
G17     234.3          65.5               12.4 +/-    0.96      13.4 +/-    0.96  0.040 / 0.070
G18     48.2           17.8                9.8 +/-    2.63      22.8 +/-    2.63  0.060 / 0.070
G19     225.5          42.6               12.9 +/-    1.42      18.0 +/-    1.42  0.060 / 0.090
G28     23.1           58.8                9.3 +/-    1.21      10.7 +/-    1.21  0.030 / 0.040
G30     137.0          58.4               11.4 +/-    0.69      13.1 +/-    0.69  0.030 / 0.040