“…A four-pulse sequence (a), a six-pulse scheme (6). t~ = ti0 + t; + ~,t~ , t2 = t2o + 7t; + t~ , (5) where Z= At2/At 1 while t i is kept constant, or ~,= Atl/At 2 while tŸ is fixed, and At~ and At 2 are the time increments of t I and t2, respectively, tLo and t20 are initial values for t I and tE, respeetively, to ensure t 1 and t 2 are always greater than zero. To be more specific, in the expe¡ (1 + Zl)tŸ is acquired as one dimension, and (1 + 2z2)t~ is used as the other.…”