kappa_a
Here is a simple example which calculates $\int_{{\bar M}_{1,1}} k_1$.
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[AC] Arbarello, E. and Cornalba, M. Combinatorial and algebro-geometric cohomology classes on the moduli spaces of curves. J. Algebraic Geom. 5. (1996), no. 4, 705--749.
The object kappa is an indexed variable table.