ne of <code>'weibull'</code>,
<code>'median'</code>, or <code>'hazen'</code>. Points are plotted against  (i-a)/(n+1-a-b) where <code>i</code> is the rank of the value; <code>n</code> is the 
sample size and <code>a</code> and <code>b</code> are defined as: (a=0, b=0) for Weibull plotting positions; (a=.2; b=.3) for Median 
plotting positions; and (a=.5; b=.5) for Hazen plotting positions. Default <code>'weibull'</code>.</p></dd>


<dt>prob_scale_points</dt>
<dd><p>Numeric vector of probabilities to be plot