PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/03/31-22:58:00
G01     64.6           31.9                9.4 +/-    1.65      15.9 +/-    1.65  0.170 / 0.220
G07     140.4          26.5               12.4 +/-    1.23      23.5 +/-    1.23  0.170 / 0.240
G11     51.5           28.7                8.7 +/-    2.39      15.7 +/-    2.39  0.050 / 0.100
G13     268.2          36.4               12.8 +/-    1.90      19.9 +/-    1.90  0.050 / 0.070
G15     297.3          16.3               10.4 +/-    1.41      25.1 +/-    1.41  0.120 / 0.250
G17     241.9          69.6               10.3 +/-    0.45      10.9 +/-    0.45  0.100 / 0.280
G18     45.5           15.7                8.9 +/-    1.79      21.7 +/-    1.79  0.060 / 0.120
G19     228.7          46.6               12.3 +/-    2.28      16.2 +/-    2.28  0.070 / 0.120
G28     29.8           57.7               10.8 +/-    0.68      12.5 +/-    0.68  0.040 / 0.050
G30     140.1          53.8               11.6 +/-    0.61      14.1 +/-    0.61  0.040 / 0.050