This function facilitates setting options for the acmap titer merging process by returning a list of option settings.
RacMerge.options(sd_limit = 1, dilution_stepsize = 1)
When merging titers, titers that have a standard deviation of this amount or greater on the log2 scale will be set to "*" and excluded, set to NA to always simply take the GMT regardless of log titer standard deviation
The dilution stepsize to assume when merging titers (see
Returns a named list of merging options