metapost question

Walter Burkhard via texhax <[email protected]>
Newsgroups gmane.comp.tex.texhax
Message-ID <CAOLnYiF6Me7qH2aHQS2VkLVZDUSwwxfKgwhCk7Gt8Zkx3A_Fsw@mail.gmail.com> 
Hello,
How do I get the two portions of the curve to meet with the same
slope?   I have provided the metapost program below  as well as
the tex program to display the curve.

Many thanks in advance.

Walt Burkhard
curve.pdf (application/pdf, 2.2 KB) - not displayed
curve.mp (application/octet-stream, 422 B) - not displayed
curve.tex (application/x-tex, 49 B) - not displayed
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