Exlanation of data files PopDataCKMR_Gironde.Rdata and PopDataCKMR_offshore.Rdata
R version 4.0.3

Data objects
birthyears (vector): calendar birthyears of offspring and parents
yconst (vector): starting year, corresponds to 1 in Data 
Data (list):
  first_y 			// first year (=earliest birth year) (calendar year - yconst) 
  last_y  			// last year (=latest birth year) (calendar year - yconst)
  first_yS			// first year of sampling years as relative index (calendar year - yconst)
  last_yS			// last year of (tissue ) sampling years (calendar year - yconst)
  n_l				// number of length classes (columns) for matrices F_age_length and M_age_length; length in cm starting at 1 cm
  MPOPobs			// table for maternal POP, same categories as MSamp & JSamp: Length Par, Length Off, Sampling year Par, Sampling year Off, number 
  PPOPob			// table for paternatl POP, same categories as PSamp & JSamp: Length Par, Length Off, Sampling year Par, Sampling year Off, number 
  Nm				// number of rows in MSamp
  Np				// number of rows in PSamp
  Nj				// number of rows in JSamp
  MSamp				// table for number of sampled individuals that are potential mothers: Length id (cm), sampling year id (calendar year - yconst), N
  PSamp				// table for number of sampled individuals that are potential fathers : Length id (cm), sampling year id (calendar year - yconst), N
  JSamp				// table for number of potential offspring : Length id (cm), sampling year id (calendar year - yconst), N
  is_mature_F		// probability matrix for female i being mature (1 mature, 0 immature) at birth of offspring j dimension (birth years i x birth years j)
  is_mature_M		// probability matrix for male i being mature at birth of offspring j dimension (birth year i x birth year j)
  is_alive			// id (0 or 1) matrix for individual i being alive at birth of j dimension (first_yS:last_yS x first_y:last_y)
  is_born	   		// id matrix for individual with birth year i being born at birth j dimension (first_y:last_y) x (first_y:last_y)
  Agemax  			// number of age classes in PAgeLength.F/M matrices
  F_age_length		// matrix (age classes x length classes) with conditional probability of age given length for females
  M_age_length		// matrix (age classes x length classes) with conditional probability of age given length for males