Note that Hershey's (physical!) pens were about 3 times as large as his coordinate system; rendering them with a suitable thickness gives me reasonable results

Note that Hershey's (physical!) pens were about 3 times as large as his coordinate system; rendering them with a suitable thickness gives me reasonable results even at higher resolutions. (like with the pixel grill on CRTs, often older digital formats were subject to some sort of analogue low-pass filtering before being perceived)