Hi Andy,

I can definitely help you with subtracting curves in Excel. Here are the steps you can follow:

1. First, make sure that your data is organized in two columns: one for the x-values and one for the y-values.
2. Create a new column next to your y-values column and enter the baseline values for each corresponding x-value. If the baseline is consistent from data set to data set, you can copy and paste this column for each new data set.
3. Subtract the baseline values from the y-values by entering the formula
   Formula:

   "=y-value - baseline" 

   in a new column next to your baseline column. This will give you the corrected y-values.
4. Create a scatter plot with your x-values as the x-axis and the corrected y-values as the y-axis.
5. You can also add error bars to your plot to show the variability in your data.