The average true range is an exponential moving average of the true range. Wilder based the average true range on 14 periods, so that on day 14, the ATR calculation is the average of the daily true range values for the last 14 days.
Red Butte Skyline Nature Trail. This trails starts at the south end of the Medical Center Trail and is reached in the same way: go up through Fort Douglas to the north entrance of Red Butte.
Bright Angel Trail head on the south rim. Indian Garden (bright green riparian patch in the middle-far distance) and Three Mile Resthouse (right foreground) along Bright Angel Trail. The trail originates at the Grand Canyon Village on the south rim of Grand Canyon, descending 4380 feet to the Colorado River. It has an average grade of 10% along its entire length. At trail's end, the River Trail continues another 1.9 miles to the Bright Angel Campground and Phantom Ranch.