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利用fortran写的实现2D射线追踪的源代码！运行于linux下！

This directory contains the input files for 8 examples designed to
illustrate all the important features of rayinvr, tramp, pltsyn and vmodel.
The v.in, r.in, tx.in, s.in, d.in and vm.in files for the i'th example are
called vi_s.in, ri.in, txi.in, si.in, di.in and vmi.in. For each example
there are also ri_0.in and vi_0.in files which were used to create the
synthetic traveltime data (not applicable to examples 4, 6, 7 and 8). There
is also an f.in file for the 7th examples (called f7.in). Script files
called setupi are provided to setup the input files to start the i'th
example. The following table describes each example and the programs 
intended to be run for each (ri=rayinvr, tr=tramp, pl=pltsyn, vm=vmodel, 
dmp=dmplstsqr). For examples 1, 2, 3 and 5 it is instructive to run the 
3 programs in succession for a few iterations to examine the convergence 
to the true models.

Example   Description                                         Programs
-------------------------------------------------------------------------
   1      crustal example                                     vm,ri,dmp
   2      refraction statics example using head waves         vm,ri,dmp
   3      reflector example                                   vm,ri,dmp
   4      synthetics for example 3                            tr,pl
   5      refraction statics example using turning rays       vm,ri,dmp
   6      synthetics for example 1                            tr,pl
   7      real crustal data example with floating reflectors  vm,ri
   8      s-waves (Sg) and conversions (PmS) for example 1    vm,ri,tr,pl