Abstract: The physics that determines the line shape of the 1S--2S transition in magnetically trapped $bar{rm H}$ is explored. Besides obtaining an understanding of the line shape, one goal is to replace the dependence on large scale simulations of $bar{rm H}$ with a simpler integration over well defined functions. For limiting cases, analytic formulas are obtained. Example calculations are performed to illustrate the limits of simplifying assumptions. We also describe a $chi^2$ method for choosing experimental parameters that can lead to the most accurate determination of the transition frequency.
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