Chemistry Tab

This song is awesome but i havent figured it out yet only the intro so here it is:

tuning(D,A,F,C,G,D)


  D|--19----20----19----16-----||  x2
  A|----17----17----17----17---||
  F|------16----16----16----20-||
  C|---------------------------||
  G|---------------------------||
  D|---------------------------||

[ Tab from: http://www.guitartabs.cc/tabs/s/susperia/chemistry_tab.html ]
  D|--18----19----18----15-----|--18----19----18----15-----||
  A|----16----16----16----15---|----16----16----16----13---||
  F|------15----15----15----19-|------15----15----15----12-||
  C|---------------------------|---------------------------||
  G|---------------------------|---------------------------||
  D|---------------------------|---------------------------||

the second part might be wrong cause im writing this without my guitar in front of me
but ill fix it if i find it wrong.