-Another important feature of RRDtool is its ability to create graphs. The
-"graph" command uses "fetch" command internally to retrieve values from the
-database. With the retrieved values, it draws graphs as defined by the
-parameters supplied on the command line. A single graph can show different
-DS (Data Sources0) from a database. It is also possible to show the
-values from more than one databases into a single graph. Often, it is
-necessary to perform some math on the values retrieved from database, before
-plotting them. For example, in SNMP replies, memory consumption values are
-usually specified in KBytes and traffic flow on interfaces is specified in
-Bytes. Graphs for these values will be more senseful if values are
-represented in MBytes and mbps. the RRDtool graph command allows to define
-such conversions. Apart from mathematical calculations, it is also possible
-to perform logical operations such as greater than, less than, and if then
-else. If a database contains more than one RRA archive, then a question may
-arise - how does RRDtool decide which RRA archive to use for retrieving the
-values? RRDtool takes looks at several things when making its choice. First
-it makes sure that the RRA covers as much of the graphing time frame as
-possible. Second it looks at the resolution of the RRA compared to the
-resolution of the graph. It tries to find one which has the same or better
-resolution. With the "-r" option you can force RRDtool to assume a different
-resolution than the one calculated from the pixel width of the graph.
-
-Values of different variables can be presented in 5 different shapes in a
-graph - AREA, LINE1, LINE2, LINE3, and STACK. AREA is represented by a solid
-colored area with values as the boundary of this area. LINE1/2/3 (increasing
-width) are just plain lines representing the values. STACK is also an area
-but it is "stack"ed on AREA or LINE1/2/3. Another important thing to note,
-is that variables are plotted in the order they are defined in graph
-command. So, care must be taken to define STACK only after defining
-AREA/LINE. It is also possible to put formatted comments within the graph.
-Detailed instructions be found under graph manual.
+Another important feature of RRDtool is its ability to create
+graphs. The "graph" command uses the "fetch" command internally to
+retrieve values from the database. With the retrieved values it draws
+graphs as defined by the parameters supplied on the command line. A
+single graph can show different DS (Data Sources) from a database. It
+is also possible to show the values from more than one database in a
+single graph. Often, it is necessary to perform some math on the
+values retrieved from the database before plotting them. For example,
+in SNMP replies, memory consumption values are usually specified in
+KBytes and traffic flow on interfaces is specified in Bytes. Graphs
+for these values will be more meaningful if values are represented in
+MBytes and mbps. The RRDtool graph command allows to define such
+conversions. Apart from mathematical calculations, it is also possible
+to perform logical operations such as greater than, less than, and
+if/then/else. If a database contains more than one RRA archive, then a
+question may arise - how does RRDtool decide which RRA archive to use
+for retrieving the values? RRDtool looks at several things when making
+its choice. First it makes sure that the RRA covers as much of the
+graphing time frame as possible. Second it looks at the resolution of
+the RRA compared to the resolution of the graph. It tries to find one
+which has the same or higher better resolution. With the "-r" option
+you can force RRDtool to assume a different resolution than the one
+calculated from the pixel width of the graph.
+
+Values of different variables can be presented in 5 different shapes
+in a graph - AREA, LINE1, LINE2, LINE3, and STACK. AREA is represented
+by a solid colored area with values as the boundary of this
+area. LINE1/2/3 (increasing width) are just plain lines representing
+the values. STACK is also an area but it is "stack"ed on top AREA or
+LINE1/2/3. Another important thing to note is that variables are
+plotted in the order they are defined in the graph command. Therefore
+care must be taken to define STACK only after defining AREA/LINE. It
+is also possible to put formatted comments within the graph. Detailed
+instructions can be found in the graph manual.