11. Orbitally equivalent system differ only in the time parametrization . 12. There are three categories of parametrization : elastic, global and local transformation. 13. In this connection, see also McCullagh's parametrization of the Cauchy distributions. 14. Let be any parametrization of that is consistent with its order ( direction ). 15. This mapping is called a modular parametrization of level " N ". 16. The parametrization to estimate prior frequencies observed from training sequences in the case of RNAs. 17. Path composition, whenever defined, is not associative due to the difference in parametrization . 18. In more general cases, derivations can be done very efficiently using the Schwinger parametrization . 19. It may occur that an irregular point becomes regular, if one changes of parametrization . 20. This simplified parametrization saves simulation time considerably.