euler-cromer

   0.0000000000000000        1.0000000000000000       -1.0000000000000000     
   5.0000000000000003E-002  0.94750000000000001       -1.0500000000000000     
  0.10000000000000001       0.89263124999999999       -1.0973750000000000     
  0.15000000000000002       0.83553092187500000       -1.1420065625000000     
  0.20000000000000001       0.77634176644531250       -1.1837831085937500     
  0.25000000000000000       0.71521175659951175       -1.2226001969160156     
 velocity reversed
  0.25000000000000000       0.71521175659951175        1.2226001969160156     
  0.29999999999999999       0.77455373705381381        1.1868396090860400     
  0.34999999999999998       0.83195933316548132        1.1481119222333493     
  0.39999999999999997       0.88728503094423505        1.1065139555750754     
  0.44999999999999996       0.94039251614562824        1.0621497040278636     
  0.49999999999999994       0.99114902005665739        1.0151300782205821     
  0.54999999999999993        1.0394276514175449       0.96557262721774917     
  0.59999999999999998        1.0851077136498886       0.91360124464687198     
  0.65000000000000002        1.1280750065981073       0.85934585896437754     
  0.70000000000000007        1.1682221120298308       0.80294210863447213     
  0.75000000000000011        1.2054486621814799       0.74453100303298059     
  0.80000000000000016        1.2396615906776753       0.68425856992390655     
  0.85000000000000020        1.2707753651971765       0.62227549039002272     
  0.90000000000000024        1.2987122013036847       0.55873672213016390     
  0.95000000000000029        1.3234022569069337       0.49380111206497967     
   1.0000000000000002        1.3447838068679154       0.42763099921963299