Perhaps I've misunderstood, but:
"
"smooth" - all the points plotted as a continuous line.
"
But one of the three examples you gave was:
http://bitworking.org/projects/sparklines/spark.cgi?%20type=smooth&d=10,20,30,90,80,70
Which returned an image which wasn't continuous (both in the article and on my own request).
Upon investigation, I noted that there's a space after the "?", so that the type param apparently isn't recognized. Removing the space made it work as expected. But you might want to update the article's image and note that "discrete" is the default if type isn't specified.
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