Sol. type -- solution type used for computation of coordinates.

• X/S -- ionosphere linear combination of X-band and S-band group delays. Alway used if at least 8 pairs of X-band and S-band group delays were obtained.
• X -- X-band group delay. Used if less than 8 pairs of X-band and S-band group delays were obtained.
• S -- S-band group delay. Used if less than 8 pairs of X-band and S-band group delays were obtained and too few X-band observable are available.