PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/02/18-00:27:50
G01     77.1           33.1                6.3 +/-    1.25      10.4 +/-    1.25  0.090 / 0.080
G07     133.9          32.0                7.7 +/-    1.02      12.9 +/-    1.02  0.080 / 0.110
G11     56.4           33.3                6.3 +/-    1.27      10.3 +/-    1.27  0.070 / 0.050
G13     280.9          38.4                6.9 +/-    3.27      10.3 +/-    3.27  0.050 / 0.040
G15     307.1          14.0                5.3 +/-    1.99      13.5 +/-    1.99  0.090 / 0.080
G17     224.3          66.5                8.1 +/-    0.63       8.8 +/-    0.63  0.070 / 0.090
G18     50.5           18.3                4.5 +/-    3.81      10.2 +/-    3.81  0.060 / 0.080
G19     219.9          36.2                8.1 +/-    2.62      12.6 +/-    2.62  0.050 / 0.100
G28     2.8            61.2                5.4 +/-    0.73       6.1 +/-    0.73  0.140 / 0.230
G30     128.7          67.4                8.0 +/-    0.64       8.6 +/-    0.64  0.100 / 0.300