added spec_image, spec_hist, spec_boxplot and fixed some cran comments
diff --git a/docs/awesome_table_in_pdf.toc b/docs/awesome_table_in_pdf.toc
index c3af8ce..682098c 100644
--- a/docs/awesome_table_in_pdf.toc
+++ b/docs/awesome_table_in_pdf.toc
@@ -1,37 +1,38 @@
-\contentsline {section}{Overview}{2}{section*.2}%
-\contentsline {section}{Installation}{2}{section*.3}%
-\contentsline {section}{Getting Started}{2}{section*.4}%
-\contentsline {subsection}{LaTeX packages used in this package}{3}{section*.5}%
-\contentsline {subsection}{Plain LaTeX}{3}{section*.6}%
-\contentsline {subsection}{LaTeX table with booktabs}{4}{section*.7}%
-\contentsline {section}{Table Styles}{4}{section*.8}%
-\contentsline {subsection}{LaTeX options}{4}{section*.9}%
-\contentsline {subsubsection}{Striped}{4}{section*.10}%
-\contentsline {subsubsection}{Hold position}{5}{section*.11}%
-\contentsline {subsubsection}{Scale down}{5}{section*.12}%
-\contentsline {subsubsection}{Repeat header in longtable}{6}{section*.13}%
-\contentsline {subsection}{Full width?}{8}{section*.14}%
-\contentsline {subsection}{Position}{8}{section*.15}%
-\contentsline {subsection}{Font Size}{9}{section*.16}%
-\contentsline {section}{Column / Row Specification}{9}{section*.17}%
-\contentsline {subsection}{Column spec}{9}{section*.18}%
-\contentsline {subsection}{Row spec}{10}{section*.19}%
-\contentsline {subsection}{Header Rows}{11}{section*.20}%
-\contentsline {section}{Cell/Text Specification}{11}{section*.21}%
-\contentsline {subsection}{Conditional logic}{11}{section*.22}%
-\contentsline {subsection}{Visualize data with Viridis Color}{12}{section*.23}%
-\contentsline {subsection}{Text Specification}{13}{section*.24}%
-\contentsline {section}{Grouped Columns / Rows}{14}{section*.25}%
-\contentsline {subsection}{Add header rows to group columns}{14}{section*.26}%
-\contentsline {subsection}{Group rows via labeling}{14}{section*.27}%
-\contentsline {subsection}{Row indentation}{16}{section*.28}%
-\contentsline {subsection}{Group rows via multi-row cell}{16}{section*.29}%
-\contentsline {section}{Table Footnote}{20}{section*.30}%
-\contentsline {section}{LaTeX Only Features}{23}{section*.31}%
-\contentsline {subsection}{Linebreak processor}{23}{section*.32}%
-\contentsline {subsection}{Table on a Landscape Page}{23}{section*.33}%
-\contentsline {subsection}{Decimal Alignment}{25}{section*.34}%
-\contentsline {subsection}{Use LaTeX table in HTML or Word}{25}{section*.35}%
-\contentsline {section}{From other packages}{25}{section*.36}%
-\contentsline {subsection}{\texttt {tables}}{25}{section*.37}%
-\contentsline {subsection}{\texttt {xtable}}{26}{section*.38}%
+\contentsline {section}{Overview}{3}{section*.2}%
+\contentsline {section}{Installation}{3}{section*.3}%
+\contentsline {section}{Getting Started}{3}{section*.4}%
+\contentsline {subsection}{LaTeX packages used in this package}{4}{section*.5}%
+\contentsline {subsection}{Plain LaTeX}{4}{section*.6}%
+\contentsline {subsection}{LaTeX table with booktabs}{5}{section*.7}%
+\contentsline {section}{Table Styles}{5}{section*.8}%
+\contentsline {subsection}{LaTeX options}{5}{section*.9}%
+\contentsline {subsubsection}{Striped}{5}{section*.10}%
+\contentsline {subsubsection}{Hold position}{6}{section*.11}%
+\contentsline {subsubsection}{Scale down}{6}{section*.12}%
+\contentsline {subsubsection}{Repeat header in longtable}{7}{section*.13}%
+\contentsline {subsection}{Full width?}{9}{section*.14}%
+\contentsline {subsection}{Position}{9}{section*.15}%
+\contentsline {subsection}{Font Size}{10}{section*.16}%
+\contentsline {section}{Column / Row Specification}{10}{section*.17}%
+\contentsline {subsection}{Column spec}{10}{section*.18}%
+\contentsline {subsection}{Insert Images into Columns}{11}{section*.19}%
+\contentsline {subsection}{Row spec}{13}{section*.20}%
+\contentsline {subsection}{Header Rows}{13}{section*.21}%
+\contentsline {section}{Cell/Text Specification}{13}{section*.22}%
+\contentsline {subsection}{Conditional logic}{14}{section*.23}%
+\contentsline {subsection}{Visualize data with Viridis Color}{14}{section*.24}%
+\contentsline {subsection}{Text Specification}{15}{section*.25}%
+\contentsline {section}{Grouped Columns / Rows}{16}{section*.26}%
+\contentsline {subsection}{Add header rows to group columns}{16}{section*.27}%
+\contentsline {subsection}{Group rows via labeling}{17}{section*.28}%
+\contentsline {subsection}{Row indentation}{18}{section*.29}%
+\contentsline {subsection}{Group rows via multi-row cell}{18}{section*.30}%
+\contentsline {section}{Table Footnote}{22}{section*.31}%
+\contentsline {section}{LaTeX Only Features}{25}{section*.32}%
+\contentsline {subsection}{Linebreak processor}{25}{section*.33}%
+\contentsline {subsection}{Table on a Landscape Page}{25}{section*.34}%
+\contentsline {subsection}{Decimal Alignment}{27}{section*.35}%
+\contentsline {subsection}{Use LaTeX table in HTML or Word}{27}{section*.36}%
+\contentsline {section}{From other packages}{27}{section*.37}%
+\contentsline {subsection}{\texttt {tables}}{27}{section*.38}%
+\contentsline {subsection}{\texttt {xtable}}{28}{section*.39}%