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faq.md

@@ -67,15 +67,15 @@ level.
 Geodetic receivers are able to decode the so-called ionosphere-free code
 (P3), which is transmitted over the L1 and L2 carriers. Notice that L1
 and L2 are two different frequencies. As ionospheric delay changes
-affect differently L1 and L2, it is possible to calculate an additional
-correction to the ionospheric delay model. Additionally the common view
-technique helps reducing the impact of ionospheric delays on baselines
-at the 800 km level, by selecting satellites which are visible
-simultaneously by both base stations. On top of that, the use a cesium
-atomic clock allows for additional filtering of daily delay
-oscillations. Once all these techniques are applied the overall impact
-of ionospheric delays is inferior to 1ns. See [USE OF GEODETIC RECEIVERS
-FOR TAI](http://tycho.usno.navy.mil/ptti/ptti2001/paper35.pdf) by P.
+affect differently L1 and L2, it is possible to calculate an ionospheric
+delay approximation. Additionally the common view technique helps
+reducing the impact of ionospheric delays on baselines at the 800 km
+level, by selecting satellites which are visible simultaneously by both
+base stations. On top of that, the use a cesium atomic clock allows for
+additional filtering of daily delay oscillations. Once all these
+techniques are applied the overall impact of ionospheric delays is
+inferior to 1ns. See [USE OF GEODETIC RECEIVERS FOR
+TAI](http://tycho.usno.navy.mil/ptti/ptti2001/paper35.pdf) by P.
 Defraigne, G. Petit and C. Bruyninx.
 
 If needed, the time transfer could still be improved by adding a