Quality of TEC Estimated with Mod_Ion Using GPS and GLONASS Data

Table 1

Maximum vertical ionospheric range error (m).

Frequency	1st-order effect (1/𝑓^2)	2nd-order effect (1/𝑓^3)	3rd-order effect (1/𝑓^4)
𝐿1	32.5	0.036	0.002
𝐿2	53.5	0.076	0.007
𝐿0	0.0	0.026	0.006