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Create function add_var_many() using the following snippet:

    int i, len;

    char *wdata_many_vars[] = {"density", "delta", "current"};

    len = sizeof(wdata_many_vars) / sizeof(wdata_many_vars[0]);

    for (i = 0; i < len; i++)
    {
        wdata_variable wdata_var = {wdata_many_vars[i], "real", "none", "wdat"};
        wdata_add_variable(&wdata_md, &wdata_var);
    }

Then one can add cycle by:

    for (i = 0; i < len; i++)
    {
        ierr = wdata_write_cycle_many(&wdata_md, wdata_many_vars[i], pointer_to_write);
        if (ierr != 0)
        {
            printf("ERROR: Cannot add %s!\n", wdata_many_vars[i]);
            return 1;
    }

or read cycle:

    for (i = 0; i < len; i++)
    {
        ierr = wdata_read_cycle_many(&md, wdata_many_vars[i], icycle, pointer_to_read);
        if (ierr != 0)
        {
            printf("ERROR: Cannot add %s!\n", wdata_many_vars[i]);
            return 1;
        }
    }