Sd1, gel, ge2, linge2, ge2r and ge2rr elements use triangular delays set by hlen and hpk. Other elements use a difference of two exponentials. Sometimes but not always ccf will complain when ignored values of these parameters are on the command line. It is better about complaining about the absence of values that are used. Integral defaults to 0.5.
Time is in seconds.
Ratio must be greater than 1. If ratio is less than baratio, ratio is replaced by baratio. The other form gives a and b directly. Aexpco and bexpco should be in units of inverse seconds. Expco describes both excitatory and inhibitory delays in bxge2, bxge2r, bxge2rr, lamge2, lamge2r and lamge3 elements.