Figure  14-25.-Three-level  section  in  cut. Figure 14-26.-Level section in fill. In  the  section  shown  in  figure  14-25,  the ground  line  across  the  section  is  sloping  rather than  level.  Therefore,  to  plot  this  section,  you would need three different elevations: one for the left  slope  stake,  one  for  the  center-line  grade stake, and one for the right slope stake. If these three levels are taken, the section is called a three- level section in cut. If additional levels are taken midway  between  the  center  line  and  the  slope  stake on either side, it is called a five-level section in cut. Therefore, it is a section in cut because the entire  cross-sectional  area  consists  of  cut. Level, three-level, and five-level sections are called  regular  sections. Figure 14-26 shows a level section in fill; figure 14-27  shows  a  three-level  section  in  fill.  The section shown in figure 14-28 consists of both cut and  fill  and  is  called  a  sidehill  section. When a more accurate picture of cross sections than  can  be  obtained  from  regular  sections  is desired, irregular sections are taken and plotted. For  an  irregular  section  you  take,  besides  the regular levels, additional levels on either side of the center line. You take these at set intervals and at  major  breaks  in  the  ground  line. Cross  sections  may  be  preliminary  or  final. Preliminary  cross  sections,  from  the  P-line  or survey   base   line,    are  irregular  sections  that are  plotted  before  the  finished  grade  has  been determined. They may be obtained by levels run in the field or by elevations found on the contour lines  of  a  topographic  map. Final  cross  sections  are  sections  of  the  final road design. They may be prepared in the same manner as preliminary sections, or they may be regular sections plotted from field data obtained after the finished grade has been set. The term final   cross   section   is  also  applied  to  as-built sections  taken  after  construction  is  completed. PLOTTING  CROSS  SECTIONS.  Cross sections are usually plotted on cross-section paper, which comes either in rolls or sheets. It is ruled into  1-in.  squares  with  heavy,  orange  or  green 14-30