PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/19-19:58:00
G01     54.8           28.4               12.9 +/-    2.80      23.3 +/-    2.80  0.150 / 0.100
G07     144.5          17.8               17.5 +/-    1.38      40.6 +/-    1.38  0.190 / 0.100
G11     46.5           20.2               11.3 +/-    2.54      24.8 +/-    2.54  0.060 / 0.060
G13     256.5          33.1               15.5 +/-    2.75      25.5 +/-    2.75  0.050 / 0.050
G15     289.4          16.1               13.5 +/-    1.51      32.8 +/-    1.51  0.050 / 0.050
G17     273.0          76.5               16.8 +/-    0.48      17.2 +/-    0.48  0.050 / 0.050
G18     39.5           9.7                10.3 +/-    1.67      28.9 +/-    1.67  0.080 / 0.510
G19     238.4          53.8               17.1 +/-    2.30      20.7 +/-    2.30  0.090 / 0.330
G28     44.6           54.8               14.5 +/-    1.26      17.3 +/-    1.26  0.360 / 0.270
G30     146.8          46.1               17.1 +/-    0.45      22.7 +/-    0.45  0.360 / 0.360