| #### Column names for Character Dataframe | |
| - subject: Subject name or ID (derived from filename) | |
| - trial_id: Trial ID | |
| - condition: Condition (if applicable) | |
| - item: Item ID | |
| - index: | |
| - letternum: Number of the character | |
| - char: The character | |
| - char_xmin: x start position (in pixel) | |
| - char_ymin: y start position (in pixel) | |
| - char_xmax: x end position (in pixel) | |
| - char_ymax: y end position (in pixel) | |
| - char_y_center: x center position (in pixel) | |
| - char_x_center: y center position (in pixel) | |
| - assigned_line: Line of text the character belongs to | |
| - in_word_number: Number of word the character belongs to | |
| - in_word: Word the character belongs to | |
| - num_letters_from_start_of_word: Number of characters since the start of the word | |
| - in_sentence_number: Number of sentence the character belongs to | |
| - in_sentence: Sentence the character belongs to | |
| - letline: Character position from start of line | |
| - wordline: Word position from start of line for the word the character belongs to | |
| - wordsent: Word position from start of the sentence for the word the character belongs to | |
| - letword: Character position from start of word starting from space before word |