- * Required probes: r1, r2, r3. Optional: o1, o2, o3, o4.
- * 'order' fields in the d->probes list = 0, 1, 2.
- * 'order' fields in the d->opt_probes list = 3, 4, 5, 6.
+ * Required channels: r1, r2, r3. Optional: o1, o2, o3, o4.
+ * 'order' fields in the d->channels list = 0, 1, 2.
+ * 'order' fields in the d->opt_channels list = 3, 4, 5, 6.