What is the range of life sentences available under section 667.61 of the California Penal Code?

"Section 667.61 requires the trial court to impose a life sentence when the defendant is convicted of an enumerated sexual offense and the People plead and prove one or more of the specified aggravating circumstances. [Citations.] When the People prove a single circumstance listed under section 667.61, subdivision (d) or at least 2 of the circumstances listed under subdivision (e), the term is 25 years to life; when only a single circumstance under subdivision (e) is proved, the term is 15 years to life. [Citation.] [] . . . A life sentence thus may be imposed for each current count to which an offense-related circumstance attaches, subject to the rules for consecutive sentencing

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set forth in section 667.61, subdivision (g)." (People v. DeSimone (1998) 62 Cal.App.4th 693, 696-697.)