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  1.     
  2.     _G_r_a_p_h_i_c_a_l _U_n_i_t_s
  3.     
  4.          xinch(x=1)
  5.          yinch(x=1)
  6.     
  7.     _D_e_s_c_r_i_p_t_i_o_n:
  8.     
  9.          xinch and yinch convert the specified number of inches
  10.          given as their arguments into the correct units for
  11.          plotting with graphics functions.
  12.     
  13.     _E_x_a_m_p_l_e_s:
  14.     
  15.          # plot labels offset 0.2 inches to the right
  16.          # of plotted symbols in a plot
  17.          plot(x, y)
  18.          text(x+xinch(0.2), y, labs, adj=0)
  19.     
  20.