max_h = h_mean + h_spread
plot "/dev/shm/DHT22-humidity" using ($1+7200):($2 > min_h && $2 < max_h ? $2 : '') with dots title "DHT22 % hum" \
-,"/dev/shm/rtl_433-humidity" using ($1+7200):($2) with dots title "RTL433 % hum"
+,"/dev/shm/rtl_433-humidity" using ($1+7200):($2 > 10 ? $2 : '') with dots title "RTL433 % hum"
unset multiplot