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LM2903ITLX - what is the meaning of the "X"?

Other Parts Discussed in Thread: LM2903

I am designing with an LM2903 as specified by National in a 8-bump MicroSMD package.  The two type numbers to order in this config are LM2903ITLX and LM2903ITL.  What is the significance of the "X"?  I can't find any reference to the "X" in the spec at http://www.ti.com/lit/ds/symlink/lm2903-n.pdf  

thank you for any info on this - Mark