Accordion: different icons for the headers

Accordion: different icons for the headers

I would like to give the first accordion header another icon than the
other headers.
I know how to set the open and close icons for all the headers at
initializing time:
icons:
{
    header: "ui-icon-circle-arrow-e",
    headerSelected: "ui-icon-circle-arrow-s"
}
But I do not have a clue about how to set the 'some' 'header' icon
without changing all header icons.
Henk
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