Superimposing Fitted Curves on a Histogram

/****************************************************************/
/*          S A S   S A M P L E   L I B R A R Y                 */
/*                                                              */
/*    NAME: CAPCURV                                             */
/*   TITLE: Superimposing Fitted Curves on a Histogram          */
/* PRODUCT: QC                                                  */
/*  SYSTEM: ALL                                                 */
/*    KEYS: Capability Analysis,                                */
/*   PROCS: CAPABILITY                                          */
/*    DATA:                                                     */
/*                                                              */
/* SUPPORT: saswgr                                              */
/*     REF: SAS/QC Software:  Usage and Reference, Version 6,   */
/*          First Edition, Volume 1 and Volume 2                */
/*    MISC:                                                     */
/*                                                              */
/****************************************************************/

data Plates;
   label Gap='Plate Gap in cm';
   input Gap @@;
   datalines;
0.746  0.357  0.376  0.327  0.485 1.741  0.241  0.777  0.768  0.409
0.252  0.512  0.534  1.656  0.742 0.378  0.714  1.121  0.597  0.231
0.541  0.805  0.682  0.418  0.506 0.501  0.247  0.922  0.880  0.344
0.519  1.302  0.275  0.601  0.388 0.450  0.845  0.319  0.486  0.529
1.547  0.690  0.676  0.314  0.736 0.643  0.483  0.352  0.636  1.080
;

title;
ods graphics on;
proc capability data=Plates;
   var Gap;
   specs  lsl = 0.3 usl = 0.8;
   histogram /
       midpoints=0.2 to 1.8 by 0.2
       lognormal
       weibull
       gamma
       nospeclegend;
   inset n mean(5.3) std='Std Dev'(5.3) skewness(5.3)
          / pos = ne  header = 'Summary Statistics';
run;