PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/21-09:27:50
G02     200.0          22.6                4.8 +/-    2.44       9.9 +/-    2.44  0.070 / 0.080
G06     175.2          51.7                9.0 +/-    1.12      11.1 +/-    1.12  0.070 / 0.090
G13     227.9          12.6                3.9 +/-    2.57      10.2 +/-    2.57  0.090 / 0.110
G17     25.1           57.9                6.8 +/-    1.06       7.9 +/-    1.06  0.070 / 0.110
G19     331.5          70.9                5.5 +/-    0.36       5.7 +/-    0.36  0.030 / 0.020
G24     310.4          29.0                3.2 +/-    1.01       5.7 +/-    1.01  0.080 / 0.040
G28     89.7           38.6                8.2 +/-    1.17      12.2 +/-    1.17  0.040 / 0.030
G30     157.0          13.2                5.4 +/-    1.36      14.0 +/-    1.36  0.040 / 0.040