Questions about the content of the receiving point and reflection point file

[chenzhaoxingxin]

Dear teacher Huang,
I carefully studied the program you shared, and read your article "Joint transmission and reflection traveltime tomography using the fast sweeping method and the adjoint-state technique", which is of great help to my study. I think the work you have done is very meaningful, and it provides a good idea for solving practical problems, which also provides a good guidance for my study.However, I still don’t quite understand some questions. I would like to ask you:
1.The receiving point file has 4 columns, which are x, y coordinates and x and y components; the reflection point file has 3 columns, which are y coordinates and x and y components.How are the values of the x and y components in these two files, and is there any basis? If I analyze the actual data, how do the x and y components take values?
2.I read the analysis of actual data in your article. You found an obvious reflection axis in the two-dimensional profile, and used its two-way travel time as the reflection time for tomographic inversion. If there are multiple source points when analyzing the actual data, which source should be placed after the detection point corresponding to the source in the ‘RT_Syn_Mod_2D_Inv_rand2p.rec’ file for the two-way travel of the reflection axis?
The above are my questions after studying the program. My English is not very good. I hope you can bear with me. Thank you again for sharing the fruits of your labor to help us learn and look forward to your reply.

                                                                                                                             A student from China University of Petroleum