PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/13-06:27:50
G01     62.5           31.2                4.3 +/-    0.74       7.3 +/-    0.74  0.030 / 0.040
G07     141.2          23.8                6.1 +/-    2.66      12.2 +/-    2.66  0.040 / 0.040
G11     49.7           25.6                3.8 +/-    2.12       7.3 +/-    2.12  0.080 / 0.180
G13     266.9          35.6                7.0 +/-    1.72      11.0 +/-    1.72  0.090 / 0.150
G15     295.5          16.7                3.1 +/-    1.66       7.3 +/-    1.66  0.020 / 0.020
G17     253.7          75.9                7.0 +/-    0.50       7.2 +/-    0.50  0.030 / 0.020
G19     230.9          50.1                8.0 +/-    2.27      10.1 +/-    2.27  0.060 / 0.060
G28     33.3           57.0                4.8 +/-    1.13       5.6 +/-    1.13  0.050 / 0.050
G30     141.5          52.9                8.1 +/-    0.44       9.9 +/-    0.44  0.090 / 0.120