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It works well, thank you Gareth.
But I failed to find this usage in command reference file, Where can I get the graph options specification help?

Dear all, I created a new workfile by wfopen a excel file which contains some stocks trading data(see attachment). The workfile generated (see attachment) is irregular dated structured, then I made a line graph of a series, but the line was not continuous because of "sample breaks and Na handin...