1. A method for fracturing or mask data preparation comprising: inputting a desired pattern to be formed on a reticle or a reticle portion; creating a two-dimensional reticle dosage map for the reticle or reticle portion, the reticle dosage map comprising a charged particle beam dosage for each reticle image sample point; and determining a plurality of shots, wherein shot dosage information for each shot or group of shots in the plurality of shots is combined into the reticle dosage map.