free parameter estimates appear at wrong place when printing out model summary

[FlorianSeitz]

dt <- data.frame(
x1 = c(100, -100),
px = 1,
x2 = 0,
y1 = c(200, -200),
py = c(.71, .64),
y2 = 0,
rp = 1) # Tversky & Kahneman, 1992, pp. 313
tk_par <- c(beta = 0.88, lambda = 2.25, gammap = 0.61, gamman = 0.69)
M <- cpt(rp ~ x1 + px + x2 | y1 + py + y2, ref = 0, data = dt, fix = tk_par, choicerule = "softmax")

**alpha and tau are being fit
print out:

M

alpha and tau appear, as the other parameters, in the constrained parameters; the free parameter estimates is an empty vector of length 0.**