PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-16:12:30
G07     335.4          58.8                8.7 +/-    0.59      10.0 +/-    0.59  0.030 / 0.040
G08     98.9           52.9               10.9 +/-    0.53      13.3 +/-    0.53  0.030 / 0.050
G09     188.7          71.4               11.1 +/-    0.90      11.7 +/-    0.90  0.050 / 0.070
G11     145.1          14.3               11.9 +/-    2.75      30.1 +/-    2.75  0.050 / 0.120
G23     154.8          35.2               11.6 +/-    0.76      18.3 +/-    0.76  0.030 / 0.030
G27     52.9           30.3                9.5 +/-    2.24      16.5 +/-    2.24  0.040 / 0.040
G28     239.2          31.4               12.5 +/-    2.01      21.3 +/-    2.01  0.120 / 0.140
G30     304.2          37.1                9.6 +/-    1.16      14.7 +/-    1.16  0.080 / 0.110