PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-11:58:10
G07     335.8          59.0                4.0 +/-    0.57       4.6 +/-    0.57  0.070 / 0.090
G08     94.4           52.0                3.5 +/-    0.65       4.3 +/-    0.65  0.070 / 0.100
G09     184.2          70.0                6.4 +/-    1.00       6.8 +/-    1.00  0.040 / 0.040
G11     143.9          14.7                3.4 +/-    1.69       8.5 +/-    1.69  0.030 / 0.040
G23     156.0          38.7                5.3 +/-    0.73       7.9 +/-    0.73  0.110 / 0.150
G27     53.4           30.8                3.5 +/-    1.72       6.0 +/-    1.72  0.070 / 0.100
G28     238.8          31.0                7.7 +/-    1.26      13.2 +/-    1.26  0.050 / 0.080
G30     303.0          35.6                6.5 +/-    1.03      10.2 +/-    1.03  0.050 / 0.060