What does the list below the map indicate?

The list below the map provides a set of conditional statements related to precipitation or some other quantifiable measure, likely in millimeters per year (мм в год). It defines ranges and what they signify:

• 1) 100 мм осадков в год (100 mm of precipitation per year)
• 2) от 100 до 250 мм в год (from 100 to 250 mm per year)
• 3) от 250 до 500 мм в год (from 250 to 500 mm per year)
• 4) от 500 до 1000 мм в год (from 500 to 1000 mm per year)
• 5) от 1000 до 2000 мм в год (from 1000 to 2000 mm per year)
• от 2000 до 300 мм в год (This entry seems to have a typo, likely intended to be 'от 2000 до 3000 мм в год' or similar, given the pattern.)

There is also a heading УСЛОВНЫЕ ОБОЗНАЧЕНИЯ (Conventional Designations) and a note 7/ более 3000 мм в год (7/ more than 3000 mm per year).

This list likely serves as a legend or key to interpret geographical data, such as rainfall or snow cover, on a map or in a study related to climate.