PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-18:12:30
G02     215.0          56.4               11.3 +/-    0.67      13.3 +/-    0.67  0.040 / 0.070
G06     60.3           74.1                9.1 +/-    0.65       9.4 +/-    0.65  0.050 / 0.080
G12     319.0          37.7                7.1 +/-    1.23      10.8 +/-    1.23  0.040 / 0.080
G17     55.9           33.4                6.8 +/-    0.55      11.1 +/-    0.55  0.050 / 0.080
G19     33.4           52.6                8.7 +/-    0.59      10.7 +/-    0.59  0.090 / 0.250
G24     266.2          42.3               11.7 +/-    1.54      16.4 +/-    1.54  0.080 / 0.250
G28     121.3          15.2                9.1 +/-    1.20      22.6 +/-    1.20  0.050 / 0.080