Renko chart bug ?

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Hi,

On the Renko chart (block size 0.5) for
the ETF "EFA", the last red block closes
at 71.99 as of 1/10/07. However,
as of 1/12/07, EFA closes at 73.1.
It seems to me after the last red
block, we should see a green block
at 72.49 (71.99 + 0.5)

Is this a bug or I am missing something ?

I have attached the chart.

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Here is the chart again.

By the way, how do I insert image into
the post, instead of attaching it as a file ?

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I figured out how to show the image now :-)