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hi, I have some questions about aqua-sim,can anyone help me ? 1. In file underwaterpropagation.cc, there are no ambient nosie parameters? 2. If i want to change the communication range, I can just change the Pt_ and RXThresh? 3. In the paper 'An NS-2 Based Simulator for Underwater Sensor Netwotks', the author say that 'Aqua-Sim provides users two ways to determine the transmission range: one way is to set the transmission power and the threshold of received power level; and the other way is to set the transmission range directly.' but I have not found the second way. Although the parameter opt(range) is used in vbf_example_5.tcl, the parameter opt(range) have not been called though the whole program. 4. In the file of vbf_example_5.tcl, the parameter control_packet_size is not belong to vectorbasedforward.cc , it should be in vectorbasedvoidavoidance.cc? 5. I can not understand the grammar set rt [$node_(0) set ragent_ ] in vbf_example_5.tcl? Thanks for everyone! Best wishes!