MULTIMAPPER software VERSION 1.0 includes the modified versions of (metropolis.c) and (data_structure.h) files. Please make the new directory where you copy all the program codes of the old version. After that please copy above files to this directory (two files are now replaced with the updated versions.) You can compile the files similarly as before with the make-command. However, before execution of "make" command, it may be good idea to execute "make clean" command first. The program is implemented in the way that environmental covariates must be given as extra traits in the file. randomwalk.file includes now one extra row (last line): 13. the number of covariates (e.g. age, sex, or treatment) in the model and, if any, their indices (starting from zero) among traits. After indices, the number of classes (if classification variable, 0=regression variable) of each covariate is given. (format xxxx xxx xxx .. ) this means: first field is 4 characters long and other fields are just 3 characters long; all fields are separated with one space. two example rows: 2 1 2 0 0 <---- 2 regression covariates 2 1 2 3 4 <---- 2 classification covariates with 3 and 4 classes, respectively The prior range for the environmental effects is uniform in same range as which is given for overall mean parameter.