<h4>Legend:</h4>

<p>
<ul>
 <li> 
 RMS: r.m.s. of N,E,U standard positioning (shifted by 10m) repeated at
 15 min interval in a single-epoch stand-alone solution by GPS, GLONASS
 using concantenated navigation messages
 (yellow: problematic epochs)
 </li>
 <li> 
 CRD: coordinate time-series from GPS, GLONASS daily mean positions 
 (shifted by 10m for constellations) during a year
 (yellow: problematic epochs, black: too large outliers)
 </li>
 <li> 
 MPT: assessments of code multipath detection for all constellations, signals and frequencies
 </li>
 <li> 
 PRE: number of identified cycle-slips, clock-jumps, data gaps or small data pieces (y log-scale)
 </li>
 <li> 
 STT: number of satellites provided by system, number of RINEX present vs. header observation types
 </li>
 <li> 
 SUM: number of existing/usable epochs and excluded code/phase observations (due to a single freq, a few satellites etc.)
 </li>
</ul>
</p>