al removal time of the access unit from the CPB is specified by r,n(n)t(nb)+tc*cpb_removal_delay(n) (C-8) where tr,n( nb) is the nominal removal time of the first access unit of the previous buffering period and cpb_removal_delay(n) is the value of cpb_removal_delay specified in the picture timing SEI message associated with access unit n. The nominal removal time tr.n(n) of an access unit n that is not the first access unit of a buffering period is given by r,n(n)tn(nb)+tc*cpb_removal_delay(n) (C-9) where nb) is the nominal removal time of the first access unit of the current buffering period and cpb_removal_delay(n) is the value of cpb_removal_delay specified in the picture timing SEI message associated with access unit n. The removal time of access unit n is specified as follows: If low_delay_hrd_flag is equal to 0 or tr.(n) the removal time of access unit n is specified by n)=trn(n) (C-10) Otherwise (low_delay_hrd_flag is equal to 1 and tr,(n) <taf(n)), the removal time of access unit n is specified by (C-11) NOTE - The latter case indicates that the size of access unit n, b(n), is SO large that it prevents removal at the nominal removal time. When an access unit n is the first access unit of a buffering period, nb is set equal to n at the removal time t,(n) of the access unit n. Operation of the decoded picture buffer (DPB) The decoded picture buffer contains frame buffers. When a coded video sequence conforming to one or more of the profiles specified in Annex A is decoded by applying the decoding process specified in clauses 2-9, each of the frame buffers may contain a decoded frame, a decoded complementary field pair or a single (non-paired) decoded field that is marked as "used for reference" (reference pictures) or is held for future output (reordered or delayed pictures). When a coded video sequence conforming to one or more of the profiles specified in Annex G is decoded by applying the decoding process specified in Annex G, each frame buffer may contain a decoded frame, a decoded complementary field 