PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/19-22:57:30
G07     8.2            67.1                9.4 +/-    0.60      10.1 +/-    0.60  0.170 / 0.160
G08     69.5           51.2               10.4 +/-    0.69      12.9 +/-    0.69  0.180 / 0.080
G09     181.6          53.7               12.6 +/-    0.61      15.2 +/-    0.61  0.040 / 0.040
G11     135.1          24.7               13.8 +/-    1.87      27.2 +/-    1.87  0.040 / 0.050
G23     159.3          20.8               11.3 +/-    1.34      24.4 +/-    1.34  0.160 / 0.140
G27     41.3           18.5                8.3 +/-    2.53      18.9 +/-    2.53  0.240 / 0.180
G28     256.3          44.3               10.8 +/-    4.57      14.7 +/-    4.57  0.180 / 0.190
G30     321.9          52.1                8.9 +/-    0.53      10.9 +/-    0.53  0.110 / 0.190