tiParam.par

A typical tiParam.par file has parameters as described in this document. They are:

• primaryCheck: If greater than or equal to zero, the code runs a group finding algorithm with a 0.5 arcsec linking length. The value of primaryCheck is the maximum number of members of groups with multiplicity greater than one are allowed. This provides a check on the setting of primary.
• relaxMargin: In the "relaxed assignment" section of the cost minimization, use this value times the tile radius as the "relaxed" tile radius.
• tileRadius: Radius of a tile in degrees
• maxFibresPerTile: Number of available fibers per tile.
• minFibreSpacing: Closest two fibers can be placed on the same tile (in arcsec).
• limitCombinationIter: When optimizing the resolution of collisions, it is possible to get into situations where you need exponentially many operations to optimally solve a group. This value is the maximum number of operations allowed per group during cost minimization.
• limitCombinationFinal: Same as the last, but this is larger, because this is the maximum number during the the final fiber allocation.
• minFOFChunkSize: To do the friends-of-friends quickly, we break up the region into little chunks (which overlap), do FOF in each, and then do the book-keeping to link the groups across the edges. This parameter gives the size of the chunks. It has to be bigger than twice the linking length (the fiber collision length, that is).
• onlyDecollided: If set to 1, base the tile perturbations only on the decollided objects. This is generally what you want to do.
• costFunctionIndex: The power law index of the cost function. Set it between 0.5 and 2. A good rule of thumb is that the smaller the chunk and the more tiles which are close to the edge, the smaller the costFunctionIndex should be. This is because it rarely pays to chase after targets far away in such situations, since edge effects are so important.