Line selector - pdf2Data Documentation
The line selector converts incoming characters or paragraphs into lines.

The charSpacing property specifies the distance between two adjoining characters that is treated as a space:
Normalmeans 1 x (space character width in the current font)Largemeans 2 x (space character width in the current font)Hugemeans 4 x (space character width in the current font)
                Note: We advise using the line selector as an auxiliary selector. While it is possible to use the line selector as the first selector in the parsing pipeline, it will convert the entire PDF content into lines. Be careful, as this can negatively affect performance.
    
Output data format: 
lines
List of selectors