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 \item{lrc2}{a numeric parameter representing the natural logarithm of
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 \item{lrc2}{a numeric parameter representing the natural logarithm of
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   the rate constant of the second exponential.}
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   the rate constant of the second exponential.}
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}
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}
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\description{
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\description{
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  This \code{selfStart} model evaluates the biexponential model function
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  This \code{selfStart} model evaluates the biexponential model function
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  and its gradient.  It has an \code{initial} attribute that
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  and its gradient.  It has an \code{initial} attribute that
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  creates initial estimates of the parameters \code{A1}, \code{lrc1},
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  creates initial estimates of the parameters \code{A1}, \code{lrc1},
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  \code{A2}, and \code{lrc2}.
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  \code{A2}, and \code{lrc2}.
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}
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}
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\value{
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\value{
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  a numeric vector of the same length as \code{input}.  It is the value of
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  a numeric vector of the same length as \code{input}.  It is the value of