A 14.5 million-year record of East Antarctic Ice Sheet fluctuations from the central Transantarctic Mountains, constrained with cosmogenic &amp;lt;sup&amp;gt;3&amp;lt;/sup&amp;gt;He, &amp;lt;sup&amp;gt;10&amp;lt;/sup&amp;gt;Be, &amp;lt;sup&amp;gt;21&amp;lt;/sup&amp;gt;Ne, and &amp;lt;sup&amp;gt;26&amp;lt;/sup&amp;gt;Al