Reply To: Chemistry: Photosynthesis Dark equations Home › Forums › Nemeth Code for Math and Science › Chemistry: Photosynthesis Dark equations › Reply To: Chemistry: Photosynthesis Dark equations October 5, 2013 at 10:08 am #22224 dworthingParticipant These arrows have to be drawn. I would follow print and make them curved. If you look in the web version of Tactile Graphics Guidelines, Calvin cycle example, you will see curved arrows drawn as shown in print.