MATLAB Central - File Exchange - rating:4.9
boundedline.m
  
  boundedline.m
Mathworks
  
  boundedline.m
  Plot one or more lines with a shaded boundary (can represent error, confidence intervals, etc).
  MATLAB Central - File Exchange - rating:4.9
plotboxpos
  
  plotboxpos
Mathworks
  
  plotboxpos
  Returns the position of a plotted axis region