PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/30-14:28:00
G01     72.7           33.1                7.0 +/-    0.69      11.4 +/-    0.69  0.030 / 0.040
G07     136.5          32.4                8.5 +/-    0.61      14.1 +/-    0.61  0.030 / 0.030
G11     54.3           31.1                6.1 +/-    0.62      10.4 +/-    0.62  0.040 / 0.070
G13     276.2          37.8                8.8 +/-    0.78      13.3 +/-    0.78  0.050 / 0.090
G15     306.5          13.4                4.5 +/-    1.98      11.6 +/-    1.98  0.040 / 0.050
G17     230.7          68.3                8.8 +/-    0.68       9.4 +/-    0.68  0.030 / 0.060
G18     50.0           18.7                5.5 +/-    1.00      12.6 +/-    1.00  0.070 / 0.120
G19     222.9          37.3                9.7 +/-    0.94      14.8 +/-    0.94  0.050 / 0.120
G28     16.4           59.7                6.9 +/-    0.41       7.8 +/-    0.41  0.040 / 0.090
G30     133.7          64.7                8.3 +/-    0.38       9.1 +/-    0.38  0.050 / 0.070