The given line graph illustrates the monthly contrast fee in average for different categories of cell phones in an European country in a 9-month-period in 2002.
Overall, the sector of Domo dominated virtually with an upward trend from January to September. The same true held for almost other figure except Sim TX witnessed a mere downward trend.
In january, the monthly cost for Domo phones was the frontrunner with 15 euro, followed closely by LEx cellphones with approximately 12,5 euro per month. The two data experienced the same fluctuation when they both decreased coincidently in June. Just a month later Domo cellphones went through a moderate drop and lost its first rank.
By contrast, the data of Sim TX submerged rapidly after a period of increase from January to June and got to its peak at almost 15 euro, ended at the bottom of the graph with about 8 euro in average. The domain of alpha cellphones, aparted from the time between april and June, grew sharply and surpassed Domo to become the highest cost for phones monthly with 25 euro.