1 set terminal pngcairo mono size 600,800
10 set output '/dev/shm/temp2.png'
17 plot "/dev/shm/DS18B20-temperature" using ($1+7200):($2 > 3 ? $2 : '') with dots title "DS18B20 deg. C","/dev/shm/DHT22-temperature" using ($1+7200):($2 > 3 && $2 < 45 ? $2 : '') with dots title "DHT22 deg. C"
21 plot "/dev/shm/DHT22-humidity" using ($1+7200):($2 > 3 ? $2 : '') with dots title "DHT22 % hum"