Refer to the current Denver sectional excerpt. A large bold "66" is printed in one of the quadrangles formed by the chart's tick marks. What does this figure represent?

Why: The chart's own Maximum Elevation Figure note explains that MEFs, shown in quadrangles bounded by ticked lines of latitude and longitude, are "represented in THOUSANDS and HUNDREDS of feet above mean sea level," based on "the highest known feature in each quadrangle, including terrain and obstructions (trees, towers, antennas, etc.)," using the chart's own worked example of "12,500 feet" printed as "12" with a smaller raised "5." Read the same way, "66" (a "6" with a smaller raised "6") means 6,600 feet MSL.

• Confuses the MEF with magnetic variation, which sectional charts show as dashed isogonic lines labeled in degrees (e.g., "10°E"), not as a bold number inside a quadrangle.
• MEFs are not a regulatory minimum-altitude requirement — they are reference information showing the highest known terrain/obstruction height, for a pilot's own situational awareness and terrain-clearance planning, not a flight-altitude rule.