  The process of jet-gap-jet (JGJ) production is briefly described. The JGJ
scattering amplitude parametrisation is discussed. On the basis of full
amplitude calculations, the parametrisation formulas for the leading
logarithmic (LL) and next-to-leading logarithmic (NLL) approximations are
obtained. For each case a sum over all conformal spins is considered. The
obtained agreement is better than 0.25% for LL and 1% for NLL.
