param M;
param DER;
param chunks;

data;

param M=20;
param DER=1e-5;
param chunks = 4;

model;

param time1 symbolic = ctime();
param time2 symbolic = substr(time1,9,2)&" "&substr(time1,5,3)&" "&substr(time1,21,4)&" "&substr(time1,12,8);