Approach Chart for PAKSE
The part in question appears to be the "NON·PRECISION RECOMMENDED ALTITUDE DESCENT TAB" as described by Jeppesen glossary-legends at:
http://ww1.jeppesen.com/documents/av...ry-legends.pdf
It is designed to be an aid for non precision approaches giving a distance vs altitude table for a steady descent approach to a runway. According to Jepp:
"General Description: The Recommended Altitude Descent table, shown to facilitate the CDFA technique *, contains "check" altitudes that correlate directly to the Vertical Descent Angle (VDA) used in conjunction with the final approach segment of the procedure."
* Continuous Descent Final Approach (CDFA): see
Continuous Descent Final Approach
In this case it would place the aircraft at an altitude of 645 ft (300 AGL) at the middle marker which appears about right. Remember its non precision so would not be used in low ceiling situations.
Its amazing how much information is on these charts but you must do your homework to use them properly. I hung my wings up years ago so would appreciate any further opinion or clarification.