PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/23-04:58:10
G02     199.1          18.5                5.3 +/-    0.76      12.0 +/-    0.76  0.040 / 0.070
G06     176.1          46.4                7.2 +/-    1.02       9.5 +/-    1.02  0.040 / 0.070
G13     231.2          15.9                4.5 +/-    1.78      11.0 +/-    1.78  0.030 / 0.040
G17     15.9           63.5                2.0 +/-    0.57       2.2 +/-    0.57  0.030 / 0.040
G19     311.1          71.7                2.0 +/-    0.45       2.1 +/-    0.45  0.110 / 0.150
G24     313.2          25.6                4.3 +/-    2.76       8.3 +/-    2.76  0.080 / 0.170
G28     83.8           41.5                3.8 +/-    0.83       5.3 +/-    0.83  0.080 / 0.060
G30     155.5          15.6                6.1 +/-    1.29      15.0 +/-    1.29  0.060 / 0.050