ballot order effects

I’ve read somewhere that, in elections, the position of a candidate in the ballot affects how much votes are cast for her. Does this happens in the Portuguese Local Elections for câmara municipal? Let’s take a look. Unfortunately, I can only find computer-readable data on ballot order for the 2013 elections. There is a PDF with this information for 2005, but my efforts to automatically extract data from the document were in vain (I tried some Python PDF extraction tools)....