defines sac (sediment accumulation curve) object from tie points
See also
sac_to_adm() to transform sediment accumulation curves into age-depth models, get_T_tp() and get_L_tp() to extract time and height/length tie points
defines sac (sediment accumulation curve) object from tie points
sac_to_adm() to transform sediment accumulation curves into age-depth models, get_T_tp() and get_L_tp() to extract time and height/length tie points