Precision of cosmological constraints on Ω _k and w for five probes each in combination with WMAP in an o wCDM cosmology: SDSS BAO (Percival et al. 2010), the two time-delay lenses RXJ1131−1231 and B1608+656 (this work), SN (Suzuki et al. 2012), Cepheids (Riess et al. 2011), and reconstructed BAO (Mehta et al. 2012). Precision for Ω _k and w is defined as half the 68% CI as a percentage of 1 and −1, respectively.