1. Open up the string file in Surpac.
2. Save the file as .str and make sure you have selected the text option
3. File>import>data from many files(string)
4. Select the file that is to be colored by RL

NOTE: The field you want to colour the file on is the RL. This is in column 4. So the string number is column 4.

1. Open up the resultant file. You will notice the strings are all yellow

1. Go to the string styles. This can be accessed via the legends tab,  or display>display properties>strings and points or Customise>display properties>strings and points.
2. Open up the styles file. We need to adjust the range for the strings to cover the range of the RL/string number. In this example the string numbers are 900 up to 1100.
3. Change the 99 to the number of places in the RL. So for the above example they all need changing to 9999.

1. At the line after 18, right click and insert a line. Add 19,999,10

1. Tick the box to save the styles file and put in a new name, then save the string file. It is important that you re-save the file, else the styles file will not be associated with this string file.

1. You will see the string colours will change.