1. ING home page: http://www.ing.iac.es/.
2. ING observing conditions page: http://www.ing.iac.es/astronomy/observing/conditions/.
3. Dominguez-Palmero, L. et al., Proc. SPIE 9147–374 (2014).
4. Dominguez-Palmero, L. et al., Proc. SPIE 9149–96 (2014).
5. Benn C.R., Proc. SPIE 8448E. 0BB (2012).