PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-22:28:10
G01     43.6           19.5                9.1 +/-    0.78      20.1 +/-    0.78  0.070 / 0.170
G06     175.7          34.8               13.1 +/-    1.27      20.9 +/-    1.27  0.080 / 0.140
G13     241.8          24.8               11.1 +/-    1.76      21.8 +/-    1.76  0.090 / 0.270
G15     274.8          13.7               10.5 +/-    1.60      27.0 +/-    1.60  0.090 / 0.200
G17     333.4          75.1               11.7 +/-    0.67      12.0 +/-    0.67  0.160 / 0.440
G19     264.6          65.9               10.4 +/-    1.24      11.3 +/-    1.24  0.180 / 0.510
G24     317.8          15.7                7.1 +/-    1.36      17.5 +/-    1.36  0.040 / 0.060
G28     66.3           48.6                9.7 +/-    0.39      12.5 +/-    0.39  0.040 / 0.060
G30     152.9          30.3               13.3 +/-    0.71      23.2 +/-    0.71  0.070 / 0.090