def METHOD_NAME(self, vfields):
    if len(vfields) == 1:
        return vfields[0]
    elif self.merge_mode == 'AVG':
        vfield = SvAverageVectorField(vfields)
        return vfield
    elif self.merge_mode == 'MIN':
        if self.falloff_type == 'NONE':
            vfield = SvSelectVectorField(vfields, 'MIN')
        else:
            vfield = SvSelectVectorField(vfields, 'MAX')
        return vfield
    else: # SEP:
        return vfields