Update data/README.md

data/README.md

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 Each data entry in the AMAX-1 dataset is comprised of 4 columns. Examples and descriptions are detailed below.
 
-| Column Index | Column Descriptor | Type | Example | Description |
-|--------------|-------------------|------|---------|-------------|
+| Column Index | Column Descriptor | Example | Data Type | Description |
+|--------------|-------------------|---------|-----------|-------------|
 | 0 | compound | c1ccc2cc3ccccc3cc2c1 | ```str``` | The compound in question, represented as a SMILES string. |
 | 1 | solvent | C1CCCCC1 | ```str``` | The solvent the compound is dissolved in, represented as a SMILES string. |
 | 2 | lambda_max | 356.0 | ```float``` | The absorption maxima of the compound-solvent combination in nm. |