 STS-68 crew members continued to perform slight maneuvers to fine-tune "Endeavour"'s orbit to intersect its track on the SRL-1 mission to support a new experiment called interferometry.The trim burns adjusted the orbit to within of where it was in April as it passed over the Mammoth Mountain, Calif., backup supersite.This should allow scientists to make nearly identical measurements with the radar equipment to develop a three-dimensional comparison of environmental changes during the six months separating STS-59 and STS-68.