static int graydomain(i_ctx_t * i_ctx_p, ref *space, float *ptr)
{
    ptr[0] = 0;
    ptr[1] = 1;
    return 0;
}

static int graydomain(i_ctx_t * i_ctx_p, ref *space, float *ptr)
{
    ptr[0] = 0;
    ptr[1] = 1;
    return 0;
}
