************************************************************************
*                                                                      *
*                    E T A - M A I D - 2 0 0 3                         * 
*                                                                      *
*   new reggeized isobar model for eta photoproduction on the proton   *
*         (this version works only for the proton and Q2=0)            *
*                                          ===============             *
* for details see: W.-T. Chiang et al., Phys. Rev. C 68, 045202 (2003) *
*                                                                      *
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In Etamaid2003 there are now 2 options for the t-channel vector meson exchange:

 1) The (old) option, where the vector meson exchange is treated as a 
    single t-channel pole contribution, the same as in Etamaid2000. 

 2) A new option, where vector mesons are treated as Regge trajectories.
    The advantage is that no strong ad hoc form factors are needed to cut 
    down the strong rise of the tree level terms at high energies.
    A typical effect of the reggeization is that the amplitudes become complex,
    therefore, even without resonance contributions all polarization observables
    will be finite.

For further details, see the above reference.