What are those asiiPlotTranSignalCB functions?

[Zhiheng Cao]

Hi, I would like to set a bindkey for the Direct Plot menu in Artist,
and I found functions like

(sevDirectPlotMenu session
'(
("Transient Signal" asiiPlotTranSignalCB tran)
("Transient Minus DC" asiiPlotTranSignalNoDcCB (tran
dc_op))
("Transient Sum" asiiPlotTranAddCB tran)
("Transient Difference" asiiPlotTranSubtractCB tran)
("AC Magnitude" asiiPlotACMagCB ac)
("AC dB10" asiiPlotACDb10CB ac)
("AC dB20" asiiPlotACDb20CB ac)
("AC Phase" asiiPlotACPhaseCB ac)
("AC Magnitude & Phase" asiiPlotACMagAndPhaseCB ac)
("AC Difference" asiiPlotBodeAnalysisCB ac)
("Equivalent Output Noise" asiiPlotEqOutputNoiseCB noise)
("Equivalent Input Noise" asiiPlotEqInputNoiseCB noise)
("Squared Output Noise" asiiPlotNoiseCB noise)
("Squared Input Noise" asiiPlotSquInputNoiseCB noise)
("Noise Figure" asiiPlotNoiseFigureCB (ac noise))
("DC" asiiPlotDCCB dc)

that makes the menu,
but there is no doc for sevDirectPlotMenu nor that for any of the CB
functions. How can I do it?
Thanks.