st: Precision and ordering issue in histograms titles

["MA V" <ma_v@hotmail.com>]

Hi--
I am trying to plot several histograms in one plot using:
twoway histogram mpg, by(X)

My question is the following: My X variable is numeric, so I am having some 
precision issues with the titles of the individual histograms. For example, 
if X=-0.2 the title for the corresponding histogram will come out as being 
"-0.2000000029802322" which is not a very pretty title... So, after reading 
some of the previous posts on the precision issues in Stata I concluded that 
one way to achieve nice titles would be to create a string variable, i.e. 
gen Xstring=string(X). Now the titles of the plot come out fine when I 
replace <by(X)> with <by(Xstring)>. The only problem is that the plots do 
not come out ordered by X (i.e. from the smallest X to the largest X)  
anymore...
Is there any way of getting around the precision issue without losing the 
ordering of the histograms?
Thanks for your help.
Best.
MA

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