This tutorial introduces the Wizard of Approximation.
  1. Select data series on left panel [Points].
  2. Select menu item <Fit><Fit Function>.
  3. The 'Approximation line' Wizard appears.
  4. On step 3 select Family 'Exponential' and Function 'ExpGrowth3'.
  5. The form of equation is 't = a + b*exp(x/c)'.
  6. On step 4 click Recalc.
  7. New graph appears. See how curve fit conforms your data.
  8. On step 5 select line color and click Add Line.
  9. Close the dialog and select menu item <View><Fitting log>.