绘制直方图，错误的条形对齐和标记

Question

我在使用gnuplot时出现问题，在定义

时，x标签会向右移动（或向左移动）

set style data histograms

Plotscript：

set boxwidth 0.9 absolute
set style fill   solid 1.00 border lt -1
set key inside left top vertical Right noreverse noenhanced autotitles nobox
set style histogram clustered gap 5 title  offset character 0, 0, 0
set datafile missing '-'
set style data histograms
set xtics border in scale 0,0 nomirror rotate by -45  offset character 0, 0, 0
set xtics  norangelimit font ",8"
set xlabel "Scaling Factor"
set ylabel "Execution time [ms]"
set title "Database performance db4o vs Sqlite - Testcase 1 [indexed]" 
set logscale y
set terminal pdf
set output 'db4o_vs_sqlite_indexed.pdf'
plot 'db4o_sb1-5idx.dat' using 3:xtic(1) title 'db4o', 'sqlite_sb1-5idx.dat' using 3 title 'Sqlite'

数据：

"Scaling Factor" "Testcase 1" "Testcase 2" "Testcase 3" "Testcase 4"
1 0 34 28 11
2 1 136 91 65
3 0 297 198 101
4 0 487 297 214
10 0 3124 1896 1567
20 0 13000 7907 7628