fix cal

Author: CamDavidsonPilon

user-guide/03-Extending your Pioreactor/05-calibrate-od600.md

@@ -15,10 +15,10 @@ Depending on the purposes of your research, you may want to calibrate your Piore
 
 There are two protocols to create an OD calibration.
 
-1.  The `single_vial` protocol requires only require one vial, your sample of interest, and an accurate way to measure liquids (we recommend a micropipette of volume range 100 to 1000 uL). The protocol works by reading a dilution series. You will start with 10mL of your sample of interest cultivated in your media, at the highest density you expect to observe. During the calibration, you will specify and add an amount of your media to dilute your sample. To avoid overflowing, the program will prompt you to reduce the volume in your vial to 10mL at set intervals. Depending on your number of measurements, you may be prompted to reduce your vial volume to 10 mL. _OPTIONAL_: At this point, you may take the OD600 reading of your vial on a different instrument and input this OD600 value for the current measurement.
+1. The `single_vial` protocol requires only require one vial, your sample of interest, and an accurate way to measure liquids (we recommend a micropipette of volume range 100 to 1000 uL). The protocol works by reading a dilution series. You will start with 10mL of your sample of interest cultivated in your media, at the highest density you expect to observe. During the calibration, you will specify and add an amount of your media to dilute your sample. To avoid overflowing, the program will prompt you to reduce the volume in your vial to 10mL at set intervals. Depending on your number of measurements, you may be prompted to reduce your vial volume to 10 mL. _OPTIONAL_: At this point, you may take the OD600 reading of your vial on a different instrument and input this OD600 value for the current measurement.
 
 
-The other protocol, `standards`, requires multiple vials that each contain a liquid with measured OD600. They act as standards. This option is quicker for calibrating multiple Pioreactors, too.
+2. The other protocol, `standards`, requires multiple vials that each contain a liquid with measured OD600. They act as standards. This option is quicker for calibrating multiple Pioreactors, too.
 
 
 Calibrations should be specific to your experiment setup. Any changes to your media, culture, or optical setup (i.e. changing IR intensity, replacing pieces, or changing the angle) may require a new calibration. If everything remains consistent, then we recommend running calibrations every 6 months, or whatever suits your purposes.