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    <div class="panel-heading codesum"><span class="anchor" id="boundprocedure-get_fcn_tolerance"></span><h3>procedure, public :: <strong>get_fcn_tolerance</strong>  => es_get_fcn_tol         
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                  <h3>
    private pure function es_get_fcn_tol(this) result(x)  
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  <p>Gets the convergence on function value tolerance.</p>

  <h4>Arguments</h4>
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