wing the parameter estimates
## summary(germLL.3)

## Showing the parameter estimates with robust standard errors
## library(lmtest)
## coeftest(germLL.3, vcov = sandwich) 

## Calculating t50 with associated standard errors
## ED(germLL.3, 50)

## Calculating t10, t20, t50 with 95% confidence intervals
## ED(germLL.3, c(10, 20, 50), interval = "delta")

## Comparing t50 between combinations by means of approximate t-tests
## compParm(germLL.3, "e", "-")

## Making plots of fitted regression curves for each