The figure below shows scale factor RU as a function of time over the age of the universe.Ignoring the presence of dark energy,which curve would represent a flat universe? 
Definitions:
Narcolepsy
A neurological disorder that affects the control of sleep and wakefulness, leading to excessive daytime sleepiness and uncontrollable sleep attacks.
Awake
The state of being conscious and aware of one's surroundings, as opposed to being asleep.
Sleep
A naturally recurring state of mind and body characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity, and inhibition of nearly all voluntary muscles during rapid eye movement (REM) sleep.
Consolidation
The process by which memories become stable in the brain; a process believed to involve the strengthening of the neural connections that form memories.
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