Hi Evaristo! If commenting-out some equate statements breaks centerline structure, you can provide 'fake' fixed station. Or do the loop closure, determine stations where you cut centerline by commenting equate command, get its coordinates (cartesian or latlong by exporting to kml), and use fix command with those coordinates, that will preserve 'compilation' ability of whole your centerline.
You can also Introduce that fake fixed stations iteratively, i.e. first one will be closer to centerline beginning on a surface, second deeper and so on, than you can see how loop clousure moves that junction points loop-by-loop. While introducing fixed points, you can allow them to be 'not so fixed', i.e. by providing values of standart deviation around them. Look at fix command syntax: fix <station> [<x> <y> <z> [<std x> <std y> <std z>]] when all 8 parameters entered, that construct an ellipsoid around point (x,y,z) with (stdx stdy stdz) dimensions.
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