  We have measured the differential Conductance of Au/Y1-xCaxBa2Cu3O7-delta
point contacts in the regime where it is dominated by Andreev reflection, which
enhances its value at low bias. We find that the characteristics can not be
fitted by a pure d-wave Order Parameter (OP). Using the formalism developed by
Kashiwaya and Tanaka[1], the best fits are obtained by adding a sub-dominant
imaginary OP, whose amplitude appears to depend on the transparency of the
contact. At high transparencies it can reach up to 60% of the total amplitude
of the OP. for lower transparencies it is substantially smaller. We attribute
this enhancement, at high transparencies to a proximity effect between the Au
tip and the superconducting electrode
